Hello, ethereum address is different from the addresses of erc20 tokens, they have their own wallet address but they are under the ethereum network. Coinbase is a multi wallet exchange, yes you can use it also to get some erc20 address but only those supported by their custody. Much bette look into more online wallets that support erc20 tokens such as mew, eidoo, mycrypto, trust wallet, atomic wallet and many more. I believe mostly these wallets are supporting erc20 and even higher specs of it.