how to add a folder in gitignore 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: 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 3: what is add.gitignore

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