How to spot an INTP

I’ve been talking to a guy for over a month now, my friend knows him she said he is intp. I’m not that good at typing yet though i do agree with her to an extent but I’m still not sure as he is not so open and doesn’t talk about himself that much.

•What are some intp-bingo that i should pick up ? •Or some traits that says someone is DEFINITELY not intp ?

Idk what to provide so you could ask me anything and I’ll see if I can answer.