Any wallets are only as safe as you are. I would usually recommend keeping coins offline in a physical hardeare wallet like a trezor or ledger nano etc but sometimes these are not the best options for a newcommer to bitcoin. If you're a newbie with little knowledge I would actually recommend blockhain.info. You can either use their web wallet or download the app for your phone and it's basically like Paypal but for bitcoin. If you set up all the security features such as 2-factor authentification and a second password/pin it is very safe. In fact, there's actually more security features on the blockchain app/website than there is on either my paypal or online banking accounts. Just remember to write your recovery seed down and keep it safe so you can still restore your coins even if you forget your password etc but also take note of my very first sentence.