2.- Do not waste money: you may think that if a telescope is really expensive, it should be the best, but if you are a beginner, it is better to buy a basic and cheap one to master your knowledge of astronomy. after that and if you have the possibility you can buy a professional telescope.
My first telescope:
My current telescope:
3 Take care of your telescope: The telscope has optic parts that are relly fragile, never try to clean it with liquids or soap. For that yopu can buy special cleaning items for telescopes.
4 Share your hobby: Do not be selfish with your telescope, you can invite your friends or family to observe the wonderful night sky.