I love spending hours on TV Tropes.
I know some people feel daunted by the whole ‘it’s all been done before’ of writing, but personally I love it. Each writer has their own unique point of view to bring to a story, and to tropes.
I consider the site an excellent resource, because you can not only get a fun description of the trope, but you can get lots of examples from tv, anime, books, etc. that make the trope more understandable. It also is excellent because I can justify the time there as ‘research’.
I’ve had characters who’s motivation I couldn’t figure out, and since knowing why they’re risking it all to do the Thing you need them to do, motivation is critical. Time spent on TV Tropes gives me lots of ideas that I can test out with the character.