how to format a gitignore code example

Example 1: gitignroe remove folder

git rm -r --cached some-directory
git commit -m 'Remove the now ignored directory "some-directory"'
git push origin master

Example 2: .gitignore

node_modules
.DS_Store
.env

Example 3: gitignore folder

in .gitignore:
	folder/

Example 4: what to add to gitignore

Look at this awesome site!
https://www.toptal.com/developers/gitignore
Generates a gitignore for you, based on the technologies you're using