I'd like to buy some bitcoins, just for a few hundred Dollars. Pretty new to it, so I tried BTDitect. Apparently I needed a wallet so downloaded Coinbase to make a Wallet and wanted to add money to it but that fails (Mastercard) with messsage "you bank doesn't allow cryptocurrency transfers".
Iow: what should I do to do a limited gamble on some bitcoins, the most secure way?
Thanks for your input.