it is the safest way to save your coins (hardware wallet), but a ledger doesn't support all coins (yet). only the popular ones like eth, btc, ada ...
Can you suggest me some hardware wallets which support almost any coins?There's more than 1000 cryptocurrencies and counting, so that would be quite a feat
As far as alts are concerned, while Ledger supports only a fraction of available cryptocurrencies it still has the widest range:
Ledger:
https://www.ledgerwallet.com/cryptocurrencies
Trezor:
https://coinsutra.com/trezor-supported-coins/
KeepKey:
https://www.keepkey.com/keepkey/faq/compatibility/