A hardware wallet is a great option, so is cold storage which you can do with a cheap $50 laptop. Most important is keeping backups. Think about how you will access your coins when your laptop or hardware wallet dies. Think about ways to prevent loss due to natural disaster. Multi-sig and shamirs secret sharing scheme are two ways to store coins in such a way that you won't lose them if your house burns down without having to trust a single party to custody them.