Easy.
Hardware wallets like Ledger Nano S or Trezor. For me it is the best option to secure your bitcoin. It is really easy to use and to setup. Just don't share your privatif key and keep your 24 seed-words secret. Never trust anyone.
After that, if you don't do "mistakes", (share private key etc) destop wallets are fine too.
I never experimented problems with wallets but remember, it is your money, nobody is here to keep it for you. Choose wisely and the most secure way to keep it safe.