An effective mindset for entrepreneurship is that everything you do is a system.
As a Business Analyst, I define a system of a collection of 1 or more processes. Each process has inputs, had a defined set of steps, and produces outputs.
The art of creating systems is determining what the different systems should be. If you think of a car, it is a transportation system. That system is a collection of smaller independent systems: steering, engine, exhaust, electrical. These systems are separate from each other. This operation allows a complicated system to be created as a collection of simpler systems.
In business, the systems are sometimes severe systems all done at the same time. The art is understanding the system and the interrelations to create a collection of decoupled systems. The decoupled systems are simpler and can be refined without having to worry about the other systems in the collection.
This is an ongoing process.