Straight conversion depends on current price of STEEM and SBD. If SBD is less than $1, then it would be beneficial to convert because the peg of $1 is what the STEEM is going to be converted on. Other than that, you can just trade SBD to other cryptocurrencies, or SBD->SP using Blocktrades if you want to convert it. Really though, you can trade cryptos using SBD by itself, you don't have to convert it to anything, but it's advisable to convert to STEEM if SBD is less than $1, as it currently is. Heck I'm converting my SBD as we speak!

Savings is only there to secure your STEEM and SBD in case your account is compromised. It has a holding period for withdrawal, so that's a good security buffer until you resolve the issue. You don't have to put anything in the savings if you don't want to though. Personally, I haven't used it.

No worries about the questions, I'm happy to help out whenever I can. Though, I'm not in any way an expert on the topic, so I'm just answering based on my understanding. Full disclosure, everything I said could be incorrect, so it's best to check it against other tutorials and the whitepaper. There are tons of helpful tutorials here on Steemit made by people more knowledgeable than I am.