What are the best Dashboard Design/Layout References?

I am a back-end guy learning front end as I create Dash pages. My charts and graphs look all right, but in no way look like a polished professional Dashboard. What are some good references (sites, books, or Udemy/other classes) that would give me the best education on Dashboard design in the shortest amount of time. My initial searches keep pointing to things related to Tableau or other frameworks.

thanks everyone.