Balance
Use your arrows to shift your balance from front to back to change the way your bike accelerates, handles, and jumps. This can help avoid losing control. If you lean back too far, shift your weight forward to rebalance yourself.
Betting
Only accept a bet to beat another player's ghost run on tracks that you have practiced on and are familiar with. If you win, you will earn more coins. However, a loss will deduct coins from your total.
Coins
Do not spend coins on customizing your character. The different clothes and helmets for your character are only cosmetic and will not improve your performance. Instead, save your coins for upgrading your starting bike and saving for the next bike.
Hopping
Tap the small spring button above your shifting arrows to hop. Use it to get over small bumps in a track that can slow you down. Hopping is also useful when dealing with loops, such as the one in "Depot 5".
Various Gameplay Tips
Watching your head is of paramount importance naturally as you will get incapacitated when you hit your head on an obstacle.
You can compete against another player's ghost in order to earn extra cash, but just remember to practice the stage before you put your money on the line.
If you don't have a lot of coins use that which you have on upgrading your bike rather than on customizing your helmet and clothes. Bike upgrades will earn you extra money on the racing track, and then you'll be able to afford looking fly.
Tournaments put you up against players from around the world and are an amazing way to earn quite a lot of coins.