Complete the campaign
I know, In a guide about improving at multiplayer, I’m recommending you spend six to seven hours playing through the campaign. But bear with me. First off, it’s one of the best Call of Duty storylines in recent memory, but it’s also an excellent introduction to the gameplay and mechanics you’ll encounter in multiplayer. It’s similar to the Training Course, providing you with a foundation.
While the AI may not pose a significant challenge, especially on normal difficulty or lower, they will allow you to test out your aim, learn cover mechanics, time your abilities, and memorize hotkeys for gadgets and equipment, all of which transfer over to multiplayer.
