Ledger Nano S (Hardware Wallet)
The Ledger Nano S is one of the most inexpensive Ethereum hardware wallets available ($59). Here, Ether is stored offline on the device. Whenever you want to spend Ether, Ledger signs in using the private key stored on the device.
You can store both ETH & ETC. I have published a few video guides on using Ledger Nano S that you must check out. This will help you learn everything about Ledger Nano S.
The best thing about the Ledger Nano S is that it comes with a small OLED screen allowing you to control your transactions. Although not advisable, its robust security makes it usable for even a hacked system.