Helping my friends get started with investing - what basics should I cover?

I'm a recent grad, and a lot of my friends are graduating as well. I'm looking to help them get started with investing. Nobody in my friend group works in finance, but I've spent a fair amount of time learning about personal finance and investing. I thought it would be helpful to put together a simple introduction for anyone who's interested.

Right now I'm planning to cover:

* Choosing a brokerage (probably only talking about ones I use: Robinhood, Public, and Fidelity)
* The importance of compound interest and starting early
* Roth IRA vs. regular taxable brokerage accounts
* ETFs/index funds (mainly using VOO as the example)

I want to keep it super simple and avoid overwhelming people with stock picking so I will be only recommending them to consistently investing in VOO.

Am I missing anything?