- file size - earliest committed files - most recently committed files - tests / examples folders If it's a popular library, I also go to github and search

- file size - earliest committed files - most recently committed files - tests / examples folders If it's a popular library, I also go to github and search for "import <library name>" and go to the code results, and look at a few examples of files from different projects that use that library to see how it can actually be used