Which wallet do you use for storing your ERC-20 token?
I personally like MEW because it's very easy to use. Some people like Trezor or Ledger but personally I have no problems by using MEW
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In MEW you have complete access to your private keys.
Wherever we store it, we must maintain the security of the wallet to the maximum. For erc 20 tokens, MEW is indeed quite effective and easy to use. We must maintain the security of the private key by storing it in a safe place, using another access key as a backup. I think Trezor and Ledger are the best, especially if you have a large enough asset, the security is guaranteed comparable to the cost you have to spend.