Ask HN: How did you get better at Open-Source?

To any good Open-Source Contributor:

How do you approach a large Codebase without getting overwhelmed by it?

How do you find a good project that suits your taste?

When to stop looking for good first issues? (I couldn't find any good guide that does not tell about searching for good first issues)

I know that I should find something that is somehow connected to my work, like a library/product I am using and then start working on it and I agree that it is true but it's easier than it sounds and there's more to it.

so if you have any good advice also, please...