I highly highly recommend the Ledger Nano S Hardware wallet. It holds up to 5 different cryptocurrency slots, swap in/out with over 20 cryptos without losing anything, and it's the most secure cold storage hardware wallet solution on the market right now. Never had a problem with it, works flawlessly.
I would agree with this, I have been very impressed with the ledger nano s and its ease of use.
Also might seem obvious but ensure your computer is secure, up to date virus and malware protection. Never open and click on links within emails that you don't expect or look suspicious.