This document discusses lessons learned from startup failures and things that are rarely talked about regarding entrepreneurship. It notes that the main reasons startups fail are due to not finding customers or spending too much time building instead of testing ideas. It cautions that most venture capital firms and accelerators provide little value, as only a small percentage of successful companies are backed by VCs. The document also acknowledges that startup life can be miserable if it lasts too long without revenue or funding. It advocates using tools like lean methodology and business model canvases but not obsessively at the expense of testing ideas. Finally, it raises questions entrepreneurs must consider regarding business goals, markets, funding decisions, culture, and trying unconventional approaches.