IWTL how companies and the economy work

Hello!

I'm looking for beginner friendly resources, to understand how companies, and the stock market work. Just how they work, not to invest (yet)

Things like:

• how is a public company different from a private company? what makes public companies push out new features so much?
• basic mechanism of the stock market, and how it started
• why people with a big share count in the company can't just sell shares?
• what they're even talking about in videos like these: https://youtube.com/shorts/fw4aGhuVme4?si=UqxPNgMgw2i_tKPh

Thanks!