Where can I buy hardware wallet like trezor, and the other? is it safe to keep my bitcoin there? What happens if there is damage to the hardware?
Salutations! We have personally had experience with the Trezor and KeepKey hardware wallets. Both are very secure, and integrated into the various sites that are commonly used while managing a cryptocurrency portfolio. Trezor is the most ubiquitous of the hardware wallets, you will find the most functionality specifically with this particular wallet. And if the device is ever damaged beyond use, you can access your accounts by using your key phrase (generated during wallet setup) with a new device, or directly in many wallet portals (MEW for example).
This is correct. Depending on the platforms you are using, the Trezor will be the most useful hardware wallet you can use. KeepKey is well featured, to be sure, but it is not as integrated with platforms as the Trezor. This is especially true if you are using MEW, and EtherDelta.