I just bought 0.23 bitcoin at coinbase, they are legit right?
Congrats, and welcome to the Forum!
The cool thing about Bitcoin is that bitcoin is as legit as long as transactions are hitting the blockchain. Like any currency that's not linked to a tangible asset, it's the belief of a collective group of people that the currency and system has value that actually gives it its value. And of course it doesn't hurt to know that bitcoin can't be just manufactured, counterfeit by anyone.
Have you gotten into bitcoin faucets yet? There's a link in my profile to my favorite faucet...and if you open a wallet with Xapo.com this faucet will send payments directly to it.
What have you learned this week?
Cheers.