And if someone hacks that website all btcs will be gone?
https://bitcointalksearch.org/topic/blockchaininfo-bitcoin-block-explorer-currency-statistics-40264
blockchain.com links to blockchain.info = one of the most popular, safe, full featured wallets there is.
I use it. It is a great wallet. Just use a very strong password and don't lose the password because if you do then your coins are lost since the web site never gets your password - all crypto takes place on your own computer.
Oh, and be sure to back up your wallet data in case the site get hacked, goes down, etc. Then you can just import it into another wallet program.