diff --git a/README.md b/README.md
index fa8629cab..18fe0960f 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,18 @@
 # Notes
 My [mostly textual] notes.
 
+## Diff sample
+Simple diff
+```diff
+10 PRINT “BASIC IS COOL”
+- 20 GOTO 11
++ 20 GOTO 10
+```
 
+## Math sample
 Sample quadratic equation is **ax<sup>2</sup> + bx + c = 0**
 
+## Diagrams sample
 Sample mermaid
 ```mermaid
   graph TD;
diff --git a/devops/vcs/git/hosting/github/markdown/emoji.txt b/devops/vcs/git/hosting/github/markdown/emoji.txt
new file mode 100644
index 000000000..c0e858d8c
--- /dev/null
+++ b/devops/vcs/git/hosting/github/markdown/emoji.txt
@@ -0,0 +1 @@
+https://github.com/ikatyang/emoji-cheat-sheet/
diff --git a/devops/vcs/git/hosting/github/markdown/markdown.txt b/devops/vcs/git/hosting/github/markdown/markdown.txt
new file mode 100644
index 000000000..d75417120
--- /dev/null
+++ b/devops/vcs/git/hosting/github/markdown/markdown.txt
@@ -0,0 +1,4 @@
+https://github.github.com/gfm/
+
+https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax
+https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/quickstart-for-writing-on-github
diff --git a/devops/vcs/git/hosting/github/markdown/svg.txt b/devops/vcs/git/hosting/github/markdown/svg.txt
new file mode 100644
index 000000000..3b43ca103
--- /dev/null
+++ b/devops/vcs/git/hosting/github/markdown/svg.txt
@@ -0,0 +1,2 @@
+2022
+https://github.blog/changelog/2022-01-21-allow-to-upload-svg-files-to-markdown/
diff --git a/devops/vcs/git/hosting/github/markdown/tex-math.txt b/devops/vcs/git/hosting/github/markdown/tex-math.txt
new file mode 100644
index 000000000..ec156d766
--- /dev/null
+++ b/devops/vcs/git/hosting/github/markdown/tex-math.txt
@@ -0,0 +1,4 @@
+https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/writing-mathematical-expressions
+
+2024
+https://github.blog/news-insights/product-news/math-support-in-markdown/