Old school artist, having a hard time with Ethereum-compatible blockchain account for digital art

Hello Everyone.

I am relatively a new artist, trying to create more digital images. I like to upload a few avatars to reddit and also upload a few animated Gifs I created. Most places ask for a "Ethereum-compatible blockchain account" that needs to be connected with a digital wallet on the sites.

my questions are:

1: are there multiple Ethereum-compatible blockchain account or sites? in other words, is this just one wallet or different sources provide this?

2: if so, which one is the better one (Safe and secure one)?

Thank you, In advance for your help. I am new to blockchains, nfts, digital money and all that, so I appreciate your help