Hello Today_hero, and welcome to the forums.
I'm sorry to say that neither of your sentences are grammatical.
Here are two suggestions.
EBay has a lot of advantages as a way to buy and sell goods and services. Some of them are that eBay is fast and you can find anything you want.
Some of the advantages of using eBay to buy and sell goods and services are that it's fast and you can find anything you want.
I don't really like using the green it's because it refers back to eBay (note the capitalization, by the way), which is pretty far back in the sentence. (Can you really buy services on eBay?)