Now that that's all cleared up, let's get to the good stuff. I'd like to start this guide off with a small list of "bad habits" newer players tend to pick up. Getting rid of these habits before anything will be a key to successfully becoming good at Halo 3.Don't worry, I will explain techniques on how to kick the habits in no time.
The first bad habbit I'd like to discuss is Melee attacks. Meleeing in Halo 3's multiplayer games is a very powerful attack. But is often abused.Here's an example of how this attack may be abused in an online match. You and an enemy player eye each other, you start to shoot, and walk towards one another while shooting, you quickly press the melee button in order to kill the enemy without realizing you were too far away to land the hit on your opponent. 9 times out of 10, you will be dead by the time you realize you pressed the melee button too early. So many new players have this bad habit and do not know how to kick it. Well, it's simple really. Go into a custom match with a few friends, play a couple games of plain old slayer, and practice on timing your melee hits correctly. By doing this, you will know when to press the melee button and successfully damage your opponents. You can also try circling them, or moving from side to side while rushing into them, because if the opponent has more health, you will die no matter what.
Next I'd like to address standing still right out in the open. A bunch of newer players do this, and for what reason? We will never know. But some advice to you guys and gals who do this, it's not very smart at all. Even if you're a "good" player, it doesn't mean you won't be triple teamed, or that you won't die. This also sticks if you have a power weapon. It's just plainly not a good idea. You may get more action this way, but you will definitely not be alive too long. So, with his being said, try to stay off on the sidelines, picking off enemies one by one. Especially if you have a weapon like the Sniper or Spartan laser.
Choosing a weapon you're not skilled with is another bad habit people tend to pick up. Just because a weapon seems good when watching another person use it, doesn't mean it will be as good when you use it. For instance, the renown sniper. If you pick up a sniper once or twice and realize you cannot aim it worth crap, next time, don't go for it. Try to play customs games and practice sniping before you spawn rush it. Most likely grabbing a weapon you're not skilled with will result in a quick death. Sometimes even humiliating.
Another huge one is not paying attention to your radar. Countless new players fail to see how useful the radar really is and end up wondering why they're dying out of nowhere. Well, here's a tip, glance at the radar and try to see if any enemies are around you. If you're on a 2-story map, the person may not be next you, but he/she may know you're under him/her and try to come for you. So always keep an eye on that radar, and also try and learn the distance between you and your opponent by using the radar.
This one is actually pretty simple, it has to do with your granades. Always use them. You get 2 at spawn in almost every match, and can pick up more as you go along. Try and get some shields down, or maybe get a kill or two with some plasma granades. Don't put them to waste and give them to another player by dying. If you're not good at tossing them, go into custom games and practice your granade throwing. Learn the distances and power of each granade, than take them into social, and later on ranked.
One more bad habit I'd like to add is getting aggrivated when someone kills you or you just aren't doing to well. This helps nothing and only makes you play worse. This is a proven fact, so watch your moods and attitude. It will help you in-game and out.