Domestika - Introduction to Design Systems with Figma

https://www.domestika.org/en/courses/1157-introduction-to-design-systems-with-figma

Learn how to create design systems that answer your users' needs
Behind every interface, there are a number of seemingly invisible details that can dictate your brand, company, or product's direction. By incorporating Design Systems' tools into your project, you can ensure that your interface works intuitively for all members of your team, regardless of the particularities of their workflow.
In this course, UX designer Javier "Simón" Cuello helps you build an interface for a website in an organized, coherent, and consistent way that satisfies your users’ and clients' real needs.
It is recommended that you also take Javier's other courses on Domestika: Interface Design with Sketch and Design a Delicious App.