Buying bitcoin doesn't have to be hard. If you want to buy bitcoin all you have to do is use a reputable service. I'm not going to list every service out there, you don't need the confusion, instead I'll give you the best.
Coinbase is as simple as it gets when it comes to buying bitcoin or ethereum. You sign up, you link your bank account, and you purchase the desired amount of Bitcoin.
Once your purchase is confirmed, you will see your Bitcoin displayed in your coinbase wallet. You can leave your balance in coinbase, or transfer it to a wallet that you control on your mobile phone or computer.