What knowledge do independent game producers need? What tools do you need to apply?

I am learning to play indie games, and the engine is CryEngine3.4 used by CryEngine 3. There must be many mistakes in the first month or so. I hope to attract more attention. After all, the large-scale simulation game should be the most complicated one in the game. Let's talk about the basic elements of the game (in fact, the basic elements of the real world): 1. The checkpoint scenes mainly include topography, vegetation, rivers, roads, caves, oceans and other landforms, as well as buildings. The main feature is that it involves a wide range and is difficult to change. 2. Living things, including people and other animals. 3. Most objects are small objects that can interact with the environment and be destroyed in the game. The above three can form an imaginary world. To simulate, we need: 1. Environmental comparison? Join the real day and night circulation system, set the real skylight, use global illumination to simulate real illumination, use high-quality shadows, HDR, self-projection and SSAO to generate realistic layering and halo, use volume light to simulate light columns, use delayed illumination to realize multi-source illumination, use depth of field to simulate foreground blur, and use particles to simulate flame ... Generally speaking, you can think that this scene is three-dimensional from the first impression.