I've studied business for way too many years.
And during all of these years, I've never even heard the most important concept once:
Buy low, sell high...
Here's the thing:
If you've found a way to get something cheaper than you can sell it for, you already know 95% of the things you need to know about business.
The rest are just details.
Now of course, buying low and selling high comes in all kinds of forms and shapes.
Here are a few of those...
Buy products/services low and sell them for more.
Buy stocks/crypto/real estate/businesses/etc low and sell high.
Hire people to create something new and sell it for more than it cost you to build it.
Hire people to improve something that already exists and sell it for more than it cost you to get the improved version of the product/service/etc.
It's all the same thing.
Buy low, sell high.
Easy to understand, really hard to pull off and therefore often ignored...