As GET is an ERC-20 token, it can be stored in compatible hardware wallets (such as the Ledger Nano S or Trezor) and web/mobile wallets (such as MetaMask or Coinbase Wallet).
See here for some pretty straightforward tutorials on each option. You should always be extra cautious when using a new wallet, make sure you understand every step and carefully check whether you are in the right place.
How do I view GET tokens in my wallet?
If you have transferred GET from a centralised exchange to your wallet, or received them directly via a DEX, your tokens may not be visible in your MetaMask wallet immediately. Follow this guide to add $GET to MetaMask: