After reading trying to get my perceptions crypto, I gather I need a wallet.
Can this wallet be in a usb stick rather than a computer, tablet/ android etc ?
My reason for this question is because many things these days has it's limits as in in "use by time", or they simply break down and data cannot be recovered.
Thanks
A USB stick (ideally encrypted) is a fine way to store a wallet. The attack surface is considerably smaller than a hardware wallet, and the security model is well understood.
But the problem you point out for computers and tablets applies to USB sticks as well. Their data can become corrupted too. Sometimes they fail and need to be formatted, rendering the data useless.
No matter what medium you use to store your wallet data, you should always have multiple backup plans. You should have more than one copy of your wallet and ideally, you should have a recovery seed (12 or 24-word phrase that can recover your wallet in case of hardware failure). Most modern wallets (Electrum, Trezor, Jaxx, Blockchain.info) provide recovery keys now.