What is CRLF and LF? What's the use case in Git?

Question

I am new exploring git commands and suddenly found LF and CRLF. When run the command git add the terminal shows the below:

LF will be replaced by CRLF in app.js. The file will have its original line endings in your working directory

-What is it about?

Answer 1

This is a duplicated question. Those are diffents types of line ending characters. You can get information about the differences on: Difference between CR LF, LF and CR line break types?

For its relation and importance on git, I think this part of the GitHub documentation expresses it very well:

Every time you press return on your keyboard you insert an invisible character called a line ending. Different operating systems handle line endings differently.

When you're collaborating on projects with Git and GitHub, Git might produce unexpected results if, for example, you're working on a Windows machine, and your collaborator has made a change in macOS.

You can configure Git to handle line endings automatically so you can collaborate effectively with people who use different operating systems.