I'm trying to buy though Electrum, but so far, no responders. I set up my wallet using the default setup and have tried different servers but nothing yet. the idea is to eventually use a coldcard.
Electrum is a wallet just like coldcard, except it is a software wallet, they both store bitcoins. Also, it is sometimes advices that you avoid coldcard and instead use Trezor or ledger to store your coins.
P.S; if you're trying to buy on electrum, you probably shouldn't be buying just yet. Before purchasing any asset, you should have done your research on it first, and understand how it works and how to safely hold it.