Optimism generates its own wallet computer software that may be readily available for obtain on its website, which allows you to store Optimism on your Laptop. For max protection, you may store your cryptocurrencies over a committed hardware wallet such as a TREZOR wallet or even a Ledger Nano https://financefeeds.com/fca-fines-barclays-40-million-over-2008-qatari-funding-disclosure-failures/