as a newbie, i don't know where to buy bitcoin and trade it from, i hope you can help me

You can buy bitcoin with local currency from any p2p platform like localbitcoins but be careful about selecting seller, traders with more transactions and high positive feedbacks are safer to do transactions with. Although escrows are put into some middle wallet after initiating and before completion of any transaction but still one needs to be careful before choosing trader on p2p exchange. Once you receive BTC in your wallet, you can transfer them to any of crypto exchange like Binance, coinbene, Bit z, Yobit or any other good exchange and trade with the pair of your choice.