Anything new needs a certain amount of sustained practice before you get the hang of it. I think I had to learn regex like four times before it stuck. I haven’t hit that point with TOML yet so I avoid it.

I’d suggest using the deeper indentation style where hyphens for arrays are also indented two spaces under the parent element. Like anything use a linter that enforces unambiguous indentation.

I prefer YAML for human-writeable config because JSON is just more typing and more finicky. The auto-typing of numbers and booleans in YAML is a pretty damn sharp edge though and I wish they’d solved that some other way.