What is a good source of Domain / Industry overviews?

I would like to understand various businesses / industries and how they work, a brief history, what is the typical value chain in that business, how is the demand and supply distributed across the globe, current trends and challenges, etc.

Typical reference material of this type is sometimes called a “101” or a “201” ... example: “Pharmaceutical Industry 101”, “Travel and Hospitality Industry 201”, etc.

Is there any online source of such concise information about different industries?

Thank you.