I started my wallet there in 2013 and forgot about it. I recovered it and now updated it to their "new wallet."
I saw a lot of posts on Reddit that say it would not be wise to use them. But I like the site and the app for my iPhone.
Dumb question, if I make an address with it, can I use that address with a different wallet? If so, do I just use the address and key to migrate it?
I think that yes, you can continue using blockchain.iinfo wallet even though with their new wallet recently, blockchain.info is one of the most popular wallets and you can continue or you can move to desktop wallet. Just stay safe and be sure nobody knows your account password and continue using bitcoin.
Indeed you always have to do this, I think it will really help you without any doubts, the fact is that you can also use the google auth app for the blockchain and I think if you do this its pretty good secured.