It is hard to define which business questions are the most essential ones.
What is major important?
Well, most relevant in your business appear the questions that people from your company ask themselves every day (over and over again). The most popular question seems to be 'How is our business performing?'.
Other examples can be found depending on the different people who have asked them: e.g.
CEO: 'Do we get the next funding round?'
employee: 'Am I still in my job next month?'
marketing: 'Did I match my annual goals? Which are my best growth channels, and what are their prices?'
or product management team: 'How is our product being used? What is the success formula of our product?'
Keep in mind that it is important to find the right tracking actions that fit the essential business actions of the company (compare part 03. They should be equal.).