Lag control:
- Don't drive directly behind the person, or risk getting lag knocked out.
- Don't stay directly beside the person, because he cannot see you when you do cause of lag. It can cause massacres at turns.
- Don't be too aggressive at overtaking at turns when taking the inside. You may get knocked into the inside corner or into some stupid pole.
Maps:
- Get to know the map. This is needed if you're going to get a highscore, so you know how every corner is like.
- Avoid poles at all cost. If you know it'd be difficult to squeeze in between a pole and a corner, don't do it.
General:
- Like Grim_Reeper said, when approaching a corner, start on the outside of the road, then the inside nearly hitting the corner, and back outside. This would ensure minimal speed is lost in a corner.
- Don't drift unless a sudden unexpected turn is needed. It's cool but slower.
- Use your brakes at the beginning of the turn, not in the middle of it. You should be accelerating by the middle of the turn.
- Use NOS on turny sections, not perfectly straight sections. Like Grim_Reeper said, it only boosts acceleration.
Cars:
- Super GT: Let go of the acceleration before it starts going out of control. Do not oversteer as well. For newbies, don't accelerate while turning.
- Elegy: Try not to drift with this car, it's way slower when drifting.
Jumping:
- Cars: Always land on all four wheels at the same time by maneuvering the car in mid air. To do this, let go of the accelerator and use the arrow keys. You can also turn the enter car in mid air by holding handbrake and using the arrow keys. This would reduce the chance of spinning out upon landing.
- Bike: Always land on both wheels at the same time (except for Go Fast FTW). It'll also reduce the chance of spinning out.
Some of these are already mentioned by Grim_Reeper though I think. Also, avoid knocking others out and have a good time racing like Grim said