What needs to be added to gitignore so as not to upload to the repository?

Question

Java

Let's say I created a project and I want to make the first commit. Which of these files should be ignored so that others do not see them? And what is the hot key to add a selected file to gitignore?

Answer 1

May come in handy in the future:
gitignore collection: https://github.com/github/gitignore