As others have pointed out, there are lots of other resources out there that contain this information. I still think it would be useful to have here in one condensed guide, but that suggests it may be worth the time to find references / links to other people who say the same things, as well as pointing out people with serious, reasoned disagreements. If you say "index funds are a good idea," that's n=1. If you say "index funds are a good idea, are recommended by several Nobel Prize-winning economists, including local favorite Daniel Kahneman, and have outperformed X% of mutual funds over the last Y decades," that a much larger n and a much more serious and valuable recommendation.

In particular, it may be valuable to discuss the application of rationality to investing- that is, Ben Graham's idea of Mr. Market, Warren Buffett / Charlie Munger, etc.