Hey, as you know already from the title, I'm new to Bitcoin, I would like you to help me by telling, where to buy, when to buy, where to sell, when to sell, things like that.
Important: I'm 17 years old, some methods may not work if I don't have 18, and that's what I have noticed.
I hope you can help me get started.

Edit: Thank you guys, your information is helping a lot, I already have a wallet, feel free to help me
1KnWzEdJgAmE3rB3Xax8sDfydnikguxrhhI suggest you have to work for your high rank first. Higher ranks will give you a high privilege in this forum and will help you earn more money. I would not advice you to buy tokens from altcoins because most of them are either unsuccessful or a scam. If you want to buy, buy cryptos like ethereum, ripple, and litecoin. In selling, the only thing you got to remember is never panic sell but if your coin came from an ICO, it is better to dump your coins immediately.