using gitignore files code example

Example 1: how to put files into gitignore

$ echo debug.log >> .gitignore
$ git rm --cached debug.log
rm 'debug.log'
$ git commit -m "Start ignoring debug.log"

Example 2: gitignore folder

in .gitignore:
	folder/

Example 3: git ignore not saving changes

git rm -rf --cached .
git add .