Use auto rifles, shotguns are nice to have you could also use a fusion rifle but don't hug onto it the whole game. The radar helps tremendously..when I first started playing crucible I sucked. Like I'm talking about bottom of the list suck. Until I realized there was a radar..I've been at the top 3 ever sense. Shoot any enemy you see. It should be pretty obvious but shoot. Always be moving, now you want to be moving because if you stay at one place for too long chances are someone will pass by and find you. Move, but be careful around edges or while in doors because someone could be sitting around crouching Crouch when your not moving. You don't disappear on the radar completely but you blink on the radar ever 5ish seconds. Learn the maps. Try to learn the maps, over time you will eventually learn them but if you want to take the time then start playing around and running around the maps Use your super every chance you get. It doesn't matter what class you are, if your a titan and you have a bubble shield, use it. If your a warlock and you have a nova bomb, use it. Don't wait until you see multiple enemies to use something like a nova bomb or fist of havoc. If you see an enemy just kill him. Use your blade dancer while indoors and you see people on your radar. Be smart about what your doing Stick to teammates. This doesn't mean steal there kills, this means stick to teammates and watch there back. If you do this and you get in a tight situation, your teammate could always turn around and help you out. Get objectives, if you are one who can't find a lot of kills, try to stick to objectives. It'll get yours scores up and your helping the team tremendously! Don't double jump in situations, why? Because when you jump, you reveal yourself to EVERYONE. Your up in the air just waiting for someone to take you down. Instead, run and crouch.