I'm basically just, as stupid as it sounds, being myself. Every person has a certain vibe or 'Aura' as I like to call it. That could be reflected in their way of speaking, their interests, their personality or just the way they take things on. From my experience, if you just act like yourself, people with similar Aura will take notice of you, meaning they find you cool or reletable or just a nice presence to be around. If you notice the other person too and like their 'Aura' as well, you'll be on a good road to becoming friends.
But of course you can't take everything at face value. Some people could be pretending to be someone they're not. But more often then not you can tell when something is just a little bit off about someones Aura. Trust your gut on this.
And then , when you've spend enough time together or just hit it off right away, CONGRATULATIONS YOU HAVE MADE A FRIEND!!!"
H3H3H3H3H.... >:]