My understanding is that no amount of anti-virus software replaces common sense. As long as you’re not downloading sketchy programs and giving them permission to run, you’re pretty well set.
Some people might tell you that there’s no viruses on Linux, but that isn’t exactly true. Linux has something like 2% of the desktop market, which makes it less attractive to develop malware for - but 2% of a few billion computers is still millions of potential targets. Not to mention that Linux dominates the server market, and arguably that’s where malware is more valuable. To think that there’s no malware targeting Linux is naive.
Many anti-virus suites are effectively malware though. If you decide you do need AV software make sure to do your research before installing any.
Anyway, long story, I don’t personally use an anti-virus, and for your stated uses I’m not sure I’d recommend one.
If you’re mostly using it as a web browser then I would definitely recommend a solid ad blocker. UBlock Origin is free, highly esteemed, and can be installed as an extension to whatever browser you’re currently using.
There’s this ad I keep seeing that I really despise. It’s for teeth-whitening toothpaste. The actress is wearing a white coat then holds up a tissue to her teeth, lamenting that her sparkling white teeth are ‘still yellow’
They cut away to teach you how toothpaste works, because surely you’ve never heard of this newfangled thing, and when they cut back she’s no longer wearing her white coat and says how much whiter her teeth are.
It’s transparently obvious that the wardrobe and tissue are just to give you something whiter to look at. But like… your teeth aren’t supposed to be freakishly white. It’s just something that Big Toothpaste wants you to feel bad about the way your body is. Also, using whitening toothpaste when you don’t need it can damage your enamel and cause you long term problems.