TL;DR
If you work as a software tester in a start-up company, this Summary: How To Start A Startup by Charles Wong is a great 57-page resource that could help you find out what is most important for Startup companies.
This document gives an overview of 18 chapters of what is a start-up company really about. From the chapter about Foundation, through Competition is for losers to Sales and marketing, you will find a lot of Charles advice and resources on these topics.
