Bitcoin Core is the easiest wallet to start out with. It stores all your Bitcoins on your local computer.
I dont agree with the Bitcoin Core as easiest wallet to start out with, because you need to sync (few days for single core CPU) and download around 60 GB. Much easier is Electrum where you dont need to download and sync full blockchain.
are there still problem in downloading 60gb in 2016? i don't think so, if he live in the usa or any advance country, you can do it in few hours, then you do a backup of the blockchain so you don't need to do it again the next time(at least it will sync faster)
newbie can use multibit for small amount, but for greater amount i prefer core, for mobile the popular is Mycelium
For most, downloading 60 GB is not a problem at all, but for few with crappy connection like paying per MB it might be issue, thats why my warning. Also it is reasonable to expect the sync to take 1 day of CPU work if you dont have good CPU. So definitively not recommended to try Bitcoin Core for newcommer in my opinion, unless he knows what he is doing.
Electrum or blockchain info should be generally better for newcommers imo.
