Visit the resources below to review the fundamental concepts relating to planning the UX and UI of your application. These resources may aid you as you progress through the different learning materials provided in this lesson.

• Human Interface Guidelines (HIG) – a comprehensive resource for designers and developers looking to create great experiences across Apple platforms.

• Images and the scale factor 1, 2, and 3 – considerations for the design of displays with higher pixel density.

• Color – a guide on color and considerations about the judicious use of color.

• Buttons – this resource provides everything you need to know about buttons.

• UX – an explanation of user experience (UX) design and how it differs from user interface (UI).

• UX design process - an outline of the UX design process.

• What is User Interface (UI) design? - an outline of what UI is and how to use it in conjunction with users' needs.