Learn what each Excel command does. Read a description, then find the command that matches it before it reaches the ground.
Pick a Ribbon tab and a command group, then choose Beginner or Advanced. Read the description at the bottom and hit the falling command that matches it. On a computer, move to aim and click to fire. On a phone or tablet, drag to aim and lift your finger to fire. Missed commands are saved so you can revisit them.
Commands you missed. Study where each one lives and what it does.