where do i put the gitignore file code example

Example 1: 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 2: 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 3: what is add.gitignore

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