Welcome to the site - I would suggest searching if you have specific questions about certain tracks or challenges as the chances are questions have mostly been answered already on this forum. There are plenty of tips for specific tracks. There are videos to show you tricks that will help. There's a lot of information here, but search really is the first step.

If you don't have any specific questions yet then just turn pilot assist off, learn the tracks and practise. It's not an easy game. But you'll get there with perseverance.