I get a lot of good, healthy information in several e-newsletters.
One of my newsletters is from Dr Josh Axe. I recommend signing up for anything he puts out; or, visit his site often. 😊 This article presents 8 herbs that have proven worth in keeping your immune system working well. I would add elderberry to it (because elderberry research shows it is effective at preventing the replication of viruses), and I have a recipe for making your own elderberry syrup here. In his article, Dr Axe describes what a virus is, and provides good advice on how to treat them with anti-viral herbs: https://draxe.com/nutrition/antiviral-herbs/.
In another article, Dr Axe extols the benefits of mullein: https://draxe.com/nutrition/mullein/.
Another of my go-to sources for natural health is Dr Eric Zelinski, and his wife, Sabrina (aka Dr Z and Mama Z). In this article, they specifically address the coronavirus: prep tips, myths, and self-care: https://naturallivingfamily.com/coronavirus-myths/.
And, because sugar is one of the top killers of your immune system, I post this webinar opportunity again, the Get off Your Sugar Summit: https://getoffsugarsummit.com/.