I have no idea what any stock should be worth at any particular time.

(Moreover, I couldn't even imagine trying to figure that out - looking at financial statements of hundreds of companies, sitting in on countless earnings calls, etc.)

That's just way too much work for a strategy that can be hard to get right: stock picking.

For me, that means I'll be sticking with low-cost index funds.

Low-cost index fund investing is a very low-maintenance approach to #investing that can work very well for practically everybody.