anyone know what to talk about to your crush without it being embarrassing or just awkward??

how can i talk to my crush if he has tried to talk to me and today was the first time that i actually got jealous and i didn’t like it it was weird and i had no reason to but these girls were flirting with my boo who isn’t my boo and i have had boyfriends but idk i have just never felt jealous before this guy and he has showed some interest in me but i feel like his shy in the dating department and i’ll admit i get nervous around him and i just want to get to know him better. but idk what to talk about and not seem weird. he is friends with some of my guy friends but idk i feel weird talking to him when they are present. he tries to talk to me and i always catch him looking at me and smiling but he doesn’t talk to me at all.