Linux is far more secure with its third party apps then Windows. In addition to this, Windows holds the lions share of the market. Malicious actors target Windows a lot more.
When you use the Software Store, it uses the same exact source and basic method to install as you do with the terminal. But whent he Store (GUI) fails, it often just seems to drop the issue, without explaining why. The terminal will tell you exactly why and what went wrong and often has suggestions on how to fix it. The GUI can only follow the basic commands its script carries, while you can intelligently choose the proper commands from a very extensive and diverse list. I believe the GUI method is worse because it leaves the User helpless and not in a position to expand their learning and understanding. They depend on it, instead of knowing how. And if it fails, it leaves them hanging in the wind.
Now, installing via Store or Terminal is really no big deal. But I try to encourage users to use the terminal as it is good training and adjustment for getting accustomed to the terminal. It is good practice. Because the Terminal is the most important, powerful and useful tool in your Desktop Toolbox. By Far. It is the Red Phone, the direct line to your wishes and the computers response.
A GUI app can only follow the limited program that the developer gave it. You have access to far more commands with the terminal than that app does- so, there will be times when entering the terminal is the only way to address a problem.
Installing from terminal is kind of taking things into your own hands. Not quite as much as building from source is... But really it is just a far more versatile and powerful utility over-all.
I really think that the actual aversion some users have to the terminal is not that it is difficult in any way, but that it is Text Based interface. It's like a first date. You are not sure what to say.
And that makes a person nervous.
After a few dates with your terminal, you'll feel a lot more comfortable.
Installing things: I remember Windows. I remember that Caution. But really, since I switched to Linux, you truly do not need to worry about "installing any ol' thing" like that anymore. Your biggest concern on Linux is Dependencies.
I am a novice Linux user- it was not very long ago I switched from Windows. This memory fresh, I believe it is useful for me to participate on this forum as I recall that Frustration all too well. So, please feel totally free to ask on the forum about any installation you would like to handle. It's hard to learn all by yourself. But installing on Linux is very easy the vast majority of the time.
A Linux Norton: Anti-virus does exist for Linux and you can search up some good ones. But in the end... I bluntly say you do not really need it. I would Never say this on a Windows forum but...
I use no anti-virus, at all on Zorin. None.