DPI, PPI, Resolution
You will find plenty of tutorials and articles on how screen design essentials work with explanation of terms and key techniques. The thing is the more you read the more complicated this topic appears. Let's focus on theory and keep it short and to the point so it is most useful in your workflow.
Vectors vs. Bitmaps
We'll explain the difference, but also get deeper into the best ways for exporting design assets from software such as Sketch, Illustrator or Photoshop. You will see multiple benefits of working in vector-only environment but also there are some hints for Photoshop design flow.