myetherwallet.com both creates private wallets as well as let you access it and make transactions, but they dont store your private key, so its safer than most. Is there an equivalent but for bitcoin?
I only recommend online wallet for less than 2 btc's worth, but if you must use one https://counterwallet.io/ is a good one. You should back up the private key for each address you have on it.
Also, don't use Windoze if you're gonna deal with cryptos, use Linux or a chromebook. You can even use VMPlayer and install LUbuntu at no cost. It's your crypto.