How to buy bitcoin

I think they way the bitcoin works there's no space for new begginners no until you sale something and use the api from bitcoin so people can pay you through it. So then you can change with real money but, still i do not trust anyone about this stuff like giving away my bitcoin, how can i be 100% sure that they will give me the amount of bitcoin in my paypal, bank account? Can't at all since bitcoin is byte not real money and it's making you anonymous. Well still can't understand why people wants to do so hard work? With dangerous stuff....