Op, here is a book that can help you understand better what Bitcoin entails, and it can also help you understand the technical aspects of it. When I first joined this forum, this is the book that helped my understanding on the entire concept of cryptography and the decentralized nature of Bitcoin. I believe if you read and understand it word for word, you'll be able to grab a lot from it. However in as much as you have come for the knowledge there are other things like forum rules that still need to be ready and obeyed because the consequences of disobeying the rule are tags or complete ban from the forum.
I don’t know if you noticed, but you didn’t actually put down the name of the supposed book you are talking about. You’ve got good reviews for the book that aroused my interest and then boom! A vital important information, the name of the book is missing.
You're absolutely right, establishing a very big business is also part of investment. "investment" as the name may imply isn't talking about cryptocurrency alone,the word "investment" is very broad.
For example:
-Building a house for rent is investment.
-Establishing a business is also part of investment.
-buying of coin is also investment,but you need to look for profiting coin to buy.
There are so many of them,but depending on your choice everyone has different ideals and thought.
Investment could be simply said to be any project that could bring in some level of income for the person. It isn’t limited and can be everything you mentioned and more.
And I don’t think anyone would think about just cryptocurrency when investments are being talked about.