diff --git a/blogs/blogs-list.org b/blogs/blogs-list.org
index 857a0bb..3d69653 100644
--- a/blogs/blogs-list.org
+++ b/blogs/blogs-list.org
@@ -4,9 +4,9 @@
 See the categories: @@html:<a href="../categories.html">Categories</a>@@
 
 * Blogs:
+- [[file:2026/2026-list.org][2026 List]] @@html:<span class="post-date">04-01-2026 17:14</span>@@ 
+- [[file:2025/2025-list.org][2025 List]] @@html:<span class="post-date">04-01-2026 17:14</span>@@ 
 - [[file:2026/01-january/04-01-week-review.org][[04-01-2026] - Weekly Review]] @@html:<span class="post-date">04-01-2026 12:12</span>@@ @@html:<a href="/tags/review.html"> <span class="post-tag">review</span> </a>@@
-- [[file:2026/2026-list.org][2026 List]] @@html:<span class="post-date">02-01-2026 09:31</span>@@ 
-- [[file:2025/2025-list.org][2025 List]] @@html:<span class="post-date">02-01-2026 09:31</span>@@ 
 - [[file:2025/12-december/28-12-week-review.org][[28-12-2025] - Weekly Review]] @@html:<span class="post-date">28-12-2025 12:12</span>@@ @@html:<a href="/tags/review.html"> <span class="post-tag">review</span> </a>@@
 - [[file:2025/12-december/21-12-week-review.org][[21-12-2025] - Weekly Review]] @@html:<span class="post-date">21-12-2025 12:12</span>@@ @@html:<a href="/tags/review.html"> <span class="post-tag">review</span> </a>@@
 - [[file:2025/12-december/14-12-week-review.org][[14-12-2025] - Weekly Review]] @@html:<span class="post-date">09-12-2025 12:12</span>@@ @@html:<a href="/tags/review.html"> <span class="post-tag">review</span> </a>@@
diff --git a/posts/career/invest-principles.org b/posts/career/invest-principles.org
index 5af8ba9..c88019e 100644
--- a/posts/career/invest-principles.org
+++ b/posts/career/invest-principles.org
@@ -2,8 +2,18 @@
 #+date: <2025-11-06 Thu 21:08>
 #+OPTIONS: num:nil tags:t toc:t
 #+filetags: :learning:notes:
-#+WIP: t
+#+WIP:
 #+COMMENTS: t
 #+SLUG: invest-principles
 
-* TODO
+The Invest Principles in Agile is a mnemonic that helps teams remember the key characteristics of a well-defined user story. The acronym INVEST stands for:
+
+- Independent: User stories should be self-contained, allowing them to be developed and delivered independently of other stories. This helps in prioritizing and scheduling work without dependencies causing delays.
+- Negotiable: User stories are not contracts; they should be flexible and open to discussion between the development team and stakeholders. This allows for adjustments based on feedback and changing requirements.
+- Valuable: Each user story should deliver value to the end-user or customer. This ensures that the team focuses on features that provide real benefits rather than just technical tasks.
+- Estimable: User stories should be clear enough to allow the team to estimate the effort required to complete them. If a story is too vague or complex, it may need to be broken down into smaller, more manageable pieces.
+- Small: User stories should be small enough to be completed within a single iteration. This helps maintain a steady flow of work and allows for quicker feedback and adjustments.
+- Testable: Each user story should have clear acceptance criteria that allow the team to verify that the story has been completed successfully. This ensures that the delivered functionality meets the expected standards and requirements.
+
+By adhering to the INVEST principles, Agile teams can create user stories that are well-defined, manageable, and focused on delivering value to users. This leads to more efficient development processes and better outcomes for projects.
+
diff --git a/posts/posts-list.org b/posts/posts-list.org
index 8ed3091..3cdf73d 100644
--- a/posts/posts-list.org
+++ b/posts/posts-list.org
@@ -4,7 +4,7 @@
 See the categories: @@html:<a href="../categories.html">Categories</a>@@
 
 * Posts:
-- [[file:career/career-list.org][Career List]] @@html:<span class="post-date">02-01-2026 09:31</span>@@ 
+- [[file:career/career-list.org][Career List]] @@html:<span class="post-date">04-01-2026 17:14</span>@@ 
 - [[file:career/probation-objectives.org][Probation Objectives:]] @@html:<span class="post-date">08-12-2025 17:55</span>@@ @@html:<a href="/tags/review.html"> <span class="post-tag">review</span> </a>@@ @@html:<a href="/tags/notes.html"> <span class="post-tag">notes</span> </a>@@
 - [[file:career/airflow.org][Datamarts, Airflow and DAG's]] @@html:<span class="post-date">15-11-2025 18:37</span>@@ @@html:<a href="/tags/learning.html"> <span class="post-tag">learning</span> </a>@@ @@html:<a href="/tags/notes.html"> <span class="post-tag">notes</span> </a>@@
 - [[file:career/normalisation.org][Benefits of Normalisation]] @@html:<span class="post-date">10-11-2025 18:04</span>@@ @@html:<a href="/tags/learning.html"> <span class="post-tag">learning</span> </a>@@ @@html:<a href="/tags/notes.html"> <span class="post-tag">notes</span> </a>@@
diff --git a/recently-updated.org b/recently-updated.org
index 6b357b0..ffeb940 100644
--- a/recently-updated.org
+++ b/recently-updated.org
@@ -2,6 +2,7 @@
 #+OPTIONS: toc:nil num:nil
 
 * Recently Updated (top 26 files - per lima's request)
+- [[file:posts/career/invest-principles.org][Invest Principles]] @@html:<span class="post-date">2026-01-04 17:15</span>@@
 - [[file:blogs/2026/01-january/04-01-week-review.org][[04-01-2026] - Weekly Review]] @@html:<span class="post-date">2025-12-31 21:43</span>@@
 - [[file:posts/career/lean.org][Lean]] @@html:<span class="post-date">2025-12-30 21:04</span>@@
 - [[file:blogs/2025/12-december/21-12-week-review.org][[21-12-2025] - Weekly Review]] @@html:<span class="post-date">2025-12-30 18:47</span>@@
@@ -18,7 +19,6 @@
 - [[file:posts/career/owasp.org][OWASP Top Ten]] @@html:<span class="post-date">2025-12-16 21:43</span>@@
 - [[file:posts/career/normalisation.org][Benefits of Normalisation]] @@html:<span class="post-date">2025-12-16 21:43</span>@@
 - [[file:posts/career/management-of-self.org][Management of self training]] @@html:<span class="post-date">2025-12-16 21:43</span>@@
-- [[file:posts/career/invest-principles.org][Invest Principles]] @@html:<span class="post-date">2025-12-16 21:43</span>@@
 - [[file:posts/career/career-intro.org][Career Introduction]] @@html:<span class="post-date">2025-12-16 21:42</span>@@
 - [[file:posts/career/airflow.org][Datamarts, Airflow and DAG's]] @@html:<span class="post-date">2025-12-16 21:42</span>@@
 - [[file:home/services.org][Service]] @@html:<span class="post-date">2025-12-16 21:41</span>@@
diff --git a/sitemap.org b/sitemap.org
index 4d0b550..4bf1601 100644
--- a/sitemap.org
+++ b/sitemap.org
@@ -18,18 +18,27 @@
   - [[file:home/setup.org][Setup]]
   - [[file:home/notes.org][Notes]]
   - [[file:home/categories.org][Categories]]
-- books
-  - [[file:books/books-list.org][Books List]]
-  - clean-code
-    - [[file:books/clean-code/clean-code-notes.org][Clean Code Notes]]
+- posts
+  - [[file:posts/posts-intro.org][Posts Introduction]]
+  - [[file:posts/posts-list.org][Posts List]]
+  - career
+    - [[file:posts/career/solid-principles.org][SOLID Principles]]
+    - [[file:posts/career/owasp.org][OWASP Top Ten]]
+    - [[file:posts/career/lean.org][Lean]]
+    - [[file:posts/career/retrospectives.org][Retrospectives]]
+    - [[file:posts/career/invest-principles.org][Invest Principles]]
+    - [[file:posts/career/career-intro.org][Career Introduction]]
+    - [[file:posts/career/wireframe-designs.org][Wireframe Designs]]
+    - [[file:posts/career/management-of-self.org][Management of self training]]
+    - [[file:posts/career/requirements-features.org][Requirements, features, user stories, tasks, walking skeletons]]
+    - [[file:posts/career/normalisation.org][Benefits of Normalisation]]
+    - [[file:posts/career/airflow.org][Datamarts, Airflow and DAG's]]
+    - [[file:posts/career/probation-objectives.org][Probation Objectives:]]
+    - [[file:posts/career/career-list.org][Career List]]
 - blogs
   - [[file:blogs/blogs-intro.org][Blogs Introduction]]
   - [[file:blogs/publish-pages.org][How to publish pages using Org Publish]]
   - [[file:blogs/blogs-list.org][Blogs List]]
-  - 2026
-    - [[file:blogs/2026/2026-list.org][2026 List]]
-    - 01-january
-      - [[file:blogs/2026/01-january/04-01-week-review.org][[04-01-2026] - Weekly Review]]
   - 2025
     - [[file:blogs/2025/2025-list.org][2025 List]]
     - 11-november
@@ -51,31 +60,22 @@
       - [[file:blogs/2025/12-december/14-12-week-review.org][[14-12-2025] - Weekly Review]]
       - [[file:blogs/2025/12-december/21-12-week-review.org][[21-12-2025] - Weekly Review]]
       - [[file:blogs/2025/12-december/28-12-week-review.org][[28-12-2025] - Weekly Review]]
-- posts
-  - [[file:posts/posts-intro.org][Posts Introduction]]
-  - [[file:posts/posts-list.org][Posts List]]
-  - career
-    - [[file:posts/career/solid-principles.org][SOLID Principles]]
-    - [[file:posts/career/owasp.org][OWASP Top Ten]]
-    - [[file:posts/career/lean.org][Lean]]
-    - [[file:posts/career/retrospectives.org][Retrospectives]]
-    - [[file:posts/career/invest-principles.org][Invest Principles]]
-    - [[file:posts/career/career-intro.org][Career Introduction]]
-    - [[file:posts/career/wireframe-designs.org][Wireframe Designs]]
-    - [[file:posts/career/management-of-self.org][Management of self training]]
-    - [[file:posts/career/requirements-features.org][Requirements, features, user stories, tasks, walking skeletons]]
-    - [[file:posts/career/normalisation.org][Benefits of Normalisation]]
-    - [[file:posts/career/airflow.org][Datamarts, Airflow and DAG's]]
-    - [[file:posts/career/probation-objectives.org][Probation Objectives:]]
-    - [[file:posts/career/career-list.org][Career List]]
+  - 2026
+    - [[file:blogs/2026/2026-list.org][2026 List]]
+    - 01-january
+      - [[file:blogs/2026/01-january/04-01-week-review.org][[04-01-2026] - Weekly Review]]
+- books
+  - [[file:books/books-list.org][Books List]]
+  - clean-code
+    - [[file:books/clean-code/clean-code-notes.org][Clean Code Notes]]
 - tags
-  - [[file:tags/introduction.org][Tag: introduction]]
   - [[file:tags/learning.org][Tag: learning]]
+  - [[file:tags/introduction.org][Tag: introduction]]
+  - [[file:tags/website.org][Tag: website]]
   - [[file:tags/notes.org][Tag: notes]]
   - [[file:tags/review.org][Tag: review]]
   - [[file:tags/emacs.org][Tag: emacs]]
   - [[file:tags/education.org][Tag: education]]
-  - [[file:tags/website.org][Tag: website]]
   - [[file:tags/reading.org][Tag: reading]]
-  - [[file:tags/insights.org][Tag: insights]]
-  - [[file:tags/maths.org][Tag: maths]]
\ No newline at end of file
+  - [[file:tags/maths.org][Tag: maths]]
+  - [[file:tags/insights.org][Tag: insights]]
\ No newline at end of file
diff --git a/wip.org b/wip.org
index fa3b559..7f813eb 100644
--- a/wip.org
+++ b/wip.org
@@ -5,5 +5,4 @@
 - [[file:blogs/2026/01-january/04-01-week-review.org][[04-01-2026] - Weekly Review]] @@html:<span class="post-date">04-01-2026 12:12</span>@@
 - [[file:blogs/2025/12-december/28-12-week-review.org][[28-12-2025] - Weekly Review]] @@html:<span class="post-date">28-12-2025 12:12</span>@@
 - [[file:blogs/2025/12-december/21-12-week-review.org][[21-12-2025] - Weekly Review]] @@html:<span class="post-date">21-12-2025 12:12</span>@@
-- [[file:posts/career/probation-objectives.org][Probation Objectives:]] @@html:<span class="post-date">08-12-2025 17:55</span>@@
-- [[file:posts/career/invest-principles.org][Invest Principles]] @@html:<span class="post-date">06-11-2025 21:08</span>@@
\ No newline at end of file
+- [[file:posts/career/probation-objectives.org][Probation Objectives:]] @@html:<span class="post-date">08-12-2025 17:55</span>@@
\ No newline at end of file