Can i trust on etherium project
I want to hold it for long term 5-10 years
Can i use hardware wallet (ledger or trezor)?
For 5-10 years, I think they will not give you a significant increase. There are permanent bears in a year and a half, and there are corrections almost every week at all. It is very risky to keep for this period, it is better to constantly reinvest with a small profit.