If you are speaking of buying the Goldshell Mini Doge from Goldshell then no, they don’t take credit card, you can only by them with USDC on their website.
There is a whole lot in the crypto world that I do absolutly not understand.
One thing is, why would you want to buy Eth to swap instead of any other currency that Coinbase is supporting?
First, its not hard. Its copy the price paste in your wallets price / amount line, back to the coinbase commerce site copy the address, paste in your wallet, click send. Complete in the time frame listed.
Of course first you need a wallet filled with some btc, eth or whatever they take.
You need to buy somewhere and fill your wallet.
Samurai wallet would automatically fill in for me.
But it only handles btc.
Oh, I bought one with a cc on aliexpress, with the authorized dealer on there. Slightly more expensive that way.
You should learn to handle crypto anyway, right?