That's what this page is for: https://caddyserver.com/docs/caddyfile/concepts#structure. You shouldn't be reading directive docs before the concepts page. The directives page https://caddyserver.com/docs/caddyfile/directives at the top also tells you where these go, which is where you must have came from to find that directive's page in the docs. The information is all there, you just need to read it. Read things in order, don't skip steps; don't skip steps in the getting started guide either, that defeats the purpose of the tour it gives you.
