If you are using the app, you can use this filter option to enter the amount you want to buy manually.

Once you find a seller "Press the buy button" It will redirect you to a chat page you can also chat with the seller.

Once you place a P2P order, the crypto asset of that seller will be freeze by Binance P2P. This will exclude your thoughts of getting scammed as binance will be your intermediary.

Send money to the seller via the suggested payment methods. Complete the fiat transaction and click "Transferred, notify seller" on Binance P2P. Once the seller confirms receipt of money, the escrowed crypto will be released to you.

This was the whole "p2p trading" Guide that you can use to buy your crypto assets.

Happy Trading :)