If you are often using public wifi, it may be worth using an encrypted link over the internet (Virtual Private Network) with your iPad. You can download a VPN app from the app store. However, I have found that I sometimes have to turn off the VPN to use BBC iPlayer properly in the UK (and a few other apps that need proof of which country you are based in - you can appear to be be almost anywhere in the world using a VPN).
Make sure that you take advantage of the security features built into your iPad (finger prints, facial recognition and/or password/numerical code - depending on the iPad model).
I agree with the above posts. The iPad doesn't need additional anti virus protection. However, take the time to work out where you are backing up your data (are you paying for iCloud storage or backing up to another device regularly?), just in case you have to carry out a factory reset if something does go wrong.
The only other thing I would suggest that is a good investment in your security would be to get used to using a password manager (PM) on your iPad - you will only ever need to know one password, just for the PM.