i am new and need something more secure than bitcoin core to store my funds, what is a better option for me trezor or ledger nano ?!...
also how to use the wallet to send funds to a BTC address, do i have to manually write it on the screen or what

Ledger Nano has a bigger screen and thus, more options. Trezor is a second best option. Though, if you choose by the price, Trezor is a bit cheaper. But both are respectable hardware wallets to keep your keys safe.