I honestly think just do it. You’ll start learning cues as you go along. Start by talking to someone, try and see who’s carrying the convo ie are you talking more or are they talking more? If it seems lop sided and they are giving dry replies then that to me means that they cba talking. With girls, it’s hard to say. I learned cues through my friends and talking about experiences. It’s a tricky one but just go out there and start learning!