I guess I'm curious what your current situation is. Do you have friendships currently that aren't good? No friendships? Are you just looking to improve what you already have? Are there places you can met friends (work, hobbies, school, etc...) Again, not sure at all what your situation is.

But in a general sense I would say that who you pick is important. I luckily have learned to have a pretty good BS detector and steer clear of people that don't seem "safe" to me. Once I have found people I think are emotionally safe, I try to be a good listener and also to share things with them. I think friendships require some risk taking and sharing of personal things, which hopefully will build trust on both sides.

I'm rambling, not sure if this answers your question at all... But I'm happy to continue the conversation if you like.