Firstly, you country would determine the type of exchange recommended to use.
Secondly, When you finally choose a recommended exchange from your country, all you need to do is fill the details and select the amount of bitcoin you wish to buy. An new page would be shown to guide you on which Card information needed. After that, you’ll have to wait a few minutes for your coin(bitcoin) to be sent to your wallet if you’re using blockchain.
Hi, I used to apply for one of the exchangers at BestChange to buy bitcoin with debit card https://www.bestchange.com/visa-mastercard-usd-to-bitcoin.html Because I am sure that this resource contains the most reliable exchanges and there is no fraud. You see, the best you can do is to rely on some trustworthy platform. Simply give it a try. All the best