diff --git a/materials/README.md b/materials/README.md
index 78a3a7e371de0518b1a5ddcff19997e5254c36cf..0d5a14a2432a6b9e558dd6a25e963ffe50e6bc8f 100644
--- a/materials/README.md
+++ b/materials/README.md
@@ -8,6 +8,8 @@
 - .gitignore
 - checkout old commits
 - stash
+- tags
+- diff
 ## 2. Git as distributed version control at RWTH (slides and sheet)
 - branches
 - merge (exercise: solve merge conflict)
@@ -25,9 +27,10 @@
 - blame
 - search through history
 - rewriting history
-- list of dangerous commands
+- list of dangerous commands (reset --hard, filter-branch, clean, rebase --interactive, restore, detached HEAD)
 - rebase (--interactive, squashing, fixup)
 - Hooks
+- Addressing commits: https://stackoverflow.com/questions/2221658/whats-the-difference-between-head-and-head-in-git
 
 # Toy project ideas
 - 1. Local: Advent of code 1st day (cross-promo und so), greekify script