My 14 year old son wants to learn how to invest. Where to start?

I think a great way to start is explaining the power of compound interest through a simple example of 2 bank accounts, then explain to him how investing is all about owning a company and getting access to it's earnings. Finally explain to him what an economic moat is and why it's important, you could use apple devices to explain the example, people are willing to pay more than the market value of the products because of the name, the ecosystem, etc.

There are loads of books on investing out there, that explain it all pretty well. William Bernstein wrote "If you can" a small book about investing aimed for younger(though working age) audiences; you can get the PDF directly here: https://www.etf.com/docs/IfYouCan.pdf

The US govt even has a website: https://www.mymoney.gov/Pages/default.aspx

Also, Bogleheads.org has a wiki and a forum and are pretty up to speed. The wiki can get pretty dense, but that's all to the good, for a curious 14yr old wanting to learn more!

I have slightly older kids(just starting to work) than you and I'm slowly building a site for them as they get into investing: https://ziefi.com

You can set up a custodial account and buy a share of a few different things (an individual stock, a sector etf, a total market etf, a bond etf, etc). Between now and the time he's 18, you can both check in on the account and track its progress.

I feel like having some real experience investing (purchases, balancing the account) is helpful, but there can definitely be a large difference in experiences based on what is purchased. He also gets to experience the benefits of investing and reinforce the behavior.

Wallstreetbets

when i was 14 i was playing nintendo, ditching school, goin to movies with girls and hoopin wid da boyz.