Love this article.

I have been doing home sourdough for years. A couple of years ago my partner got kefir grains from a relative, and she's been using it weekly. A few months ago we got a kombucha mother when giving away a rescued kitten, and the second batch (kombucha, not kitten) is in progress. She also started fermenting vegetables (carrots, cabbage, so far), that's great for spicing up salads. Hint: do not throw away mature leaven, keep it in a jar in the fridge, it makes awesome waffles.

Really, every household should be doing fermentations. It's easy, tasty, rewarding, safe and very good for your gut microbiome.