- Where did you meet your friends?
- How did you become friends from just acquaintances?
- How did you develop a relationship with your best friend?
etc
I have friends from high school
I have friends from University (+fraternity)
I have friends from going out/ clubbing
I have friends from my sports club
It's all about seeing each other regulary. That's how you build a friendship.
I met my best friend at my sports club. He quit years ago but we revived our friendship again. Closer than ever
I'm out of school so I mainly make friends from work. My old job had a lot of people around my age and we'd naturally start talking to each other when we were spending multiple hours together every day.
i don't
i just listen to what people around me are saying and try to find a way to approach them if i think they're interesting. i approach people by jumping in on their conversation when they say something i have a good response to. i feel kinda awkward doing it and it doesn't always work but it's gotten me friends before.
as for my best friend, i feel like you get a lot closer to the person once you start viewing each other as best friends. that's what happened with me. just think of one of your favorites of your friends that has good qualities to be close with for a long time (and won't get annoying quickly) and go from there. you can try to get closer to them by hanging out with them more than anyone else or sometimes it just happens naturally. if they like you enough they'll probably get close to you too.
i also just sometimes approach the first hot guy i see
I'm bad at making friends on my own.
I try to get to the new kids but someone else (someone I hate) usually gets them first 
