Research, study, and information gathering
At this point, you are presumably already identifying the idea of the project you want to create, and you want to gather the most information to evaluate the idea on the one hand and understand the target group and competitors on the other. And then use all this information in building the project plan.
The main sources of research, study, and information collection:
Aspects you need to research, study and gather information about:
First aspect: study the target group of your project
Second aspect: studying competitors
Third aspect: studying the nature of the market you intend to enter