Buying bitcoin is actually quite easy.
We strongly recommend https://www.bitcoin.com where you can use your credit card, payment app, or bank account to buy Bitcoin.
1. Select the BTC amount (given to you during our checkout).
2. Enter our address (given to you during our checkout).
3. Complete the purchase process by creating an account and providing your payment details.
They also have a great tutorial/help page here in case you need to know more.