It would be a risk to save all your cryptos on coinbase, coinbase is an exchange site and they can go solo with your crypto anytime or even get hacked.. I might recommend
https://www.myetherwallet.com but i don't use my etherwallet because they are also prone to be hacked even though not easily, i make use of wallets like imtoken and blockchain wallet.. These ones are purely safe,your mnemonic phrase and private key cannot be hacked except you give them out
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