I personally use Coinbase, I know the guy above me said don't use it, but I have never had any problems with them and all the transaction fees haven't been an issue for me as I usually only receive Bitcoin and don't send it a lot. I like Coinbase cause they are at least backed by something..
LOL. You're wrong buddy. Coinbase is not the best wallet when you can't control your private key. For now as I know the best wallet to store Bitcoin is coldstorage wallet like Trezor or ledger nano s which you can control your private key and nobody can stole your Bitcoin when you're not connect the USB stick with your computer and click the button on the USB stick.