Fundamentals are generally aspects of Rocket League that build a structure and foundation to your play. Mechanics are what elevates or amplifies this foundation and gives you more options that tie into your fundamentals.
Rotation – The basic movement required around your teammates and the field for proper positioning and efficiency.
Positioning – Being able to get to the place you are required to be for the play to keep flowing or finish.
Boost Control – The amount of boost you use and ensuring that you have enough left over after one play for the next.
Passing – The ability to properly send the ball towards your teammate(s).
Recovery – The ability to manipulate your car’s landing or movement in a situation where getting back into a position is necessary.
Shooting – The ability to send the ball toward the enemy net with some level of accuracy or placement.
Dribbling – The ability to manipulate the ball with your car on the ground with repeated contact or touches.
Aerialing: The ability to coordinate the upward movement of your car via jumping and using boost to force your car into the air in some way.
Flicking – The ability to send the ball into the air via a well timed flip from your car. An extension of dribbling.
Wave Dashing – The ability to time a flip well enough while on a surface to jump up slightly and use said flip to slam the car either back onto the surface or another surface which gives a speed boost. An extension of recovery.
Aerial Rebounding (Double taps and such) – The ability to read a ball going off of a surface and using that knowledge to time your car’s midair movement to properly collide with it and send it to your desired destination. An extension of aeraling, boost control, and possibly more depending on the desired result.
Air Dribbling – The ability to pop a ball into the air and follow it using manipulation of the ball’s physics midair similar to dribbling. An extension of aeraling, boost control, dribbling, and possibly more depending on the desired result.
Flip Resetting – The ability to manipulate the car often in midair to have all four wheels of the car touch the ball which resets the jumping option that was used to aerial before you left the ground.
After detailing what fundamentals and mechanics are, there is still another set of terms that are often talked about.
Car Control – The level of ability the player has to properly manipulate their car’s movement across the field. An extension of positioning, rotation, boost control, recovery, and wave dashing.
Ball Control – The level of ability the player has to properly manipulate the ball in any given scenario. An extension of passing, shooting, dribbling, flicking, flip resetting, and air dribbling.
If any other long time players would like to add, pitch in down below.