The Boglehead wiki is a great resource.

Beyond the investment wiki pages, it has other pages on personal finance.

It ranges from a pretty basic level up to more advanced.

Just solid, basic financial information that works for most people.

To add on, r/financialindependence has a good wiki that will also link back to Boglehead, but can cover some of the more advanced concepts and tie it into the FIRE movement (even if you don't want to RE).