omg yes lol. im not that good at it so i might not be the one to ask but heres a couple for Mario Kart 8:
1. turn auto steering off, i think its automatically on. it will fuck you up and handicap your improvement later
2. always drag an item. to drag, push and hold the item button without releasing it. dragging an item means a shell coming for you from behind will hit the item instead. if you drag a bomb, it will explode you in this case so its better not to. the speaker cant be dragged, but it can be used to destroy any items about to hit you, including blue shells, so be careful when you use it.
3, related to dragging items, if youre holding a coin already, you cant get another coin through item boxes. this means that the next item box you get will spawn an item you can drag to protect yourself instead of another coin. this is mostly helpful for first place
4. drift as much as possible.
5. and most annoyingly, try to memorize the tracks. memorizing the layout of a track, the locations of the turns and item boxes, will be the only way to become "good" at the game.
6. trick on any and all jumps. you tap the r button to trick. tricking will give you a speed boost each time,so whenever your wheels leave the ground no matter how brief, attempt to trick

these are some tips that helped me so i hope they can be helpful to you too. ty!!