Hi @Lyzbeth yes you can have a few protection services, however there are different views on this. Personally I think that if you do not go outwith the Google and Galaxy stores and have regular security updates then Knox and the protection offered by the Play store/Samsung is sufficient. Though you may choose to use it if you want to be super cautious.
Some information here : https://insights.samsung.com/2020/06/18/do-i-need-antivirus-software-on-my-smartphone-2/
Thread on Anti Virus here too https://eu.community.samsung.com/t5/other-smartphones/new-to-samsung-and-android-do-i-need-antivirus...
If we compare free virus protection systems and paid ones, then of course paid ones are much better and really protect, when the issue of protecting your data is being decided, how to save money for me is generally stupid, if you don't have enough money use article on the topic