If you're wondering where you can start with how to get better at playing Rocket League, I recommend heading over to Youtube and checking out Sunless Khan. He has a great set of Videos called "Why you suck at Rocket League". If anything, watching these videos will really help you understand how to be the player you're team needs you to be. I will post the link to the fist video below.
Why you suck at Rocket League #1
- Ball Chasing - SunlessKhan
Hope this series helps!