I recently shared my sourdough recipe . I mentioned as an aside that you can also make focaccia, pizza, and other breads from the same base. Here’s how.
Make a 1000g batch, relatively high hydration—say, 750ml. Let it rise really nicely—this batch tripled.
Pour out 1/2 C olive oil into a measuring cup. Use a bit of it—less than 1/4 C—to coat the bottom of a large sheet pan. Scrape the dough in, turn it over to coat, and let proof/rest for at least 30min. Preheat the oven to 500ºF.