Do not forget. Use Frameworks

A combination of frameworks using:
– value chain analysis
– porter 5 forces

Use it when starting a new business or for current one too to assess the direction

Filling out this chart accomplishes three things. First, it enumerates the value chain. Second, it offers a lens into the motivations of each player within the ecosystem. Third, it provides visibility into which players in the ecosystem have the most power and control the dollars. Each of these three concepts is essential to understand when entering a market.

Via How to Analyze Your Startup Like A VC in 15 Minutes Or Less

You would need to click the link to have a better picture. You might feel that starting up is all about moving fast and thinking about it later. But without a plan or a slight structure, one could go totally lost and end up wasting time.