Did you ask two identical questions—perhaps a mistake?
Linux's systems are regularly updated, which is important for timely protection. In addition, all actions on behalf of the administrator are password protected, that is, each time you are asked for permission to do this, In addition, you can set up regular password changes for greater security.
Even inexperienced users can easily figure out the UFW utility that serves as a firewall. In addition, you can encrypt your physical drives and install the minimum programs that you need. Also, with regard to viruses, Linux is considered the most secure system, since there is an opinion that such systems are less popular. But you should not completely rely on this, since everything always depends on the owner of the device, who is responsible for the cleanliness of the system.