added section on removing files from remote but not working tree

git.md

@@ -2,10 +2,13 @@
 
 ## Table of contents
 
+<<<<<<< HEAD
 - [glossary](#glossary)
+- [terminology](#terminology)
 - [branches](#branches)
   - [create a branch](#create-a-branch)
 - [submodules](#submodules)
+- [removing files from index](#removing-files-from-index)
 - [philosophies](#philosophies)
   - [merge](#merge)
   - [rebase](#rebase)
@@ -38,7 +41,7 @@ git switch <branch-name>
 ## submodules
 
 To fetch submodules of a cloned repository use:
-```bash
+```sh
 # do it manually
 git submodule init
 git submodule update
@@ -51,6 +54,15 @@ git submodule update --init --recursive
 ```
 
 
+## removing files from index
+
+To remove files from index without deleting them on disk, use:
+```sh
+git rm --cached <file-name>
+```
+This is helpful if one accidentally committed autogenerated files.
+
+
 ## philosophies
 
 Important things to always remember:
@@ -80,3 +92,5 @@ git rebase <target-branch>
 # proceeds after solving rebase conflict
 git rebase --continue
 ```
+
+