No really. Do one of these. Follow it step-by-step and make what they are making. You can make a blank design file and throw it away...
Design a simple UI from scratch for a Food App in Figma - For beginners (find files in the video description)
Figma Mobile App Design Tutorial | Speed UI Design (speed run - no headphones needed).
Figma UI Design Tutorial: Get Started in Just 24 Minutes! (Files to use)