If it is steep and you are using the back break, be sure to keep your weight back over the back wheel.

Go as slow as you need to go to feel safe and comfortable. You'll have more fun and gain skill and confidence to go a little faster.

Some people practice falling on purpose on grass, but I get enough experience falling in real life that I don't feel the need to fall on purpose.

Wear your helmet!
Wear your gloves!