The dashboard design process
The purpose of Tableau Public is to help you tell data stories interactively. Dashboard design, like view design, should tell a concise story that flows from one element to the next. When you are first starting your journey of dashboard design in Tableau Public, you should expect it to be an iterative process in which you design dashboards and revise them over time, often with input from other people. You might also find it helpful to draw out dashboards before building them in Tableau Public. Leave room and time for experimentation when building your dashboard.
You may find that more views, or different views, are needed in order to tell your story. Pulling various views together into a dashboard sometimes exposes flaws in the initial design. In that case, go back and change or add to your views, and then come back to the dashboard design process.