Practice mode is your friend. Use practice mode to familiarize yourself with the level layout and obstacles. This will help you to avoid surprises and make better decisions when you're playing for real.
Don't be afraid to die. Dying is a part of the learning process in Geometry Dash Lite. Don't get discouraged if you die a lot at first. Just keep practicing and you'll eventually get better.
Use the checkpoint system to your advantage. Checkpoints are your way of saving your progress in a level. Place checkpoints at strategic points throughout the level so that you don't have to start from the beginning if you die.