Mahalo! Sir.
You have really 3 options that are pretty safe.
The wallet called xumm, the lender called nexo, which use COLD storage and have a 375MM insurance policy, and if you rather pass on both of those, a Hardware wallet such as NANO or Trezer. I have a nano which is empty right now, since I have 4 coins including XRP on NEXO earning interest daily.
All are somewhat simple options, but for the nano/trezer you'll need to buy the device, maybe around $100.....not exactly sure. The xumm wallet is minimal one time 10 xrp cost, and NEXO is 100% free. Just not sure about the current interest rates for new accounts, I've been with them over a year.