vaginapagina | Quick STD testing question

Hey all-

I was wondering if any of you had a handy online resource that lists the safest testing windows for STD's? That is, when you can trust the tests to be as accurate as possible after potential exposure? I'm trying to advise a friend who's potentially taking on a new partner, but I'm getting my information all jumbled (it's been a while since I've thought about this personally). I see a a range of suggestions upon Googling and I trust y'all to have a resource I can trust.

FWIW, the friend in question has a penis, but is curious about both themselves and their vagina-owning new partner.

Thanks!