If you have Linux, some considerations might be:

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1. Downloads: Always download everything through the official repositories of the distribution you are occupying, so you will have less chances of getting malware.
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2. Virtual machines: If you are one of those who constantly downloads things from the Internet I recommend doing it inside a virtual machine, in this way if the file is damaged or potentially harmful you will not be able to access the other parts of the computer being totally isolated in a metaphorical box made of software. 

Some virtual machines are "Virtual Box" or "Zen Hypervisor" of the Linux distribution called Qubes Os.

There are some distributions based specifically on virtual machines such as Tails Os, Whonix Os, or Qubes Os, which separate most important processes into virtual machines automatically.

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3. Installation: If you are going to install something using the terminal make sure that you never do it with elevated privileges, since the application can access a large number of system folders, as it happens in Windows that everything is installed with administrator privileges.
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4. Flathub: There are tools to manage the awards granted to the applications installed through flatpak such as "Flatseal".
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