>>366578929
I've been trying to find the answer to that since 2018. From what I can tell, most people don't actually do that. Instead they know their friends through a group where they will happen to mutually interact, rather than making a specific effort to interact with each other one to one. Said group also conflicts with their ability to make other friends because their time is preoccupied by the group, so they have less flexibility to interact with anyone outside it.

Feel free to ignore my advice, as I've failed to make a single friend so far, but your effort is probably better spent on trying to become part of a group, which will lead to friendships, rather than trying to become friends with specific people as two individuals.