2) What if I lost or damage my hardware wallet? Do i need to buy same hardware wallet and restore my coins? or can use private keys in any other online wallet and get my coins back?
3) What if the hardware wallet is damaged or corrupt?
Many still think that having a hardware wallet means their coins are secure. But this is not the case. It's the seed that guarantee you the security. A hardware wallet can be stolen, broken, replaced many times but if you lose the seed or the seed is compromised then your coins are at risk.
I understand you are concern about your security.
Please watch this video.