how to put a file in gitignore code example

Example 1: git add gitignore

$ touch .gitignore

Example 2: how to use gitignore to ignore a folder

You can ignore entire directories, just by including their paths and putting a / on the end:

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node_modules/
logs/

Example 3: 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 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

Example 5: git ignore not saving changes

git rm -rf --cached .
git add .

Example 6: what is add.gitignore

The purpose of gitignore files is to ensure that certain files not tracked by git remain untracked.