This lab is written in a way that introduces a command, then later asks you to use that command again without explicit instructions. This is how we learn, by applying something we have done to a (slightly) new task.
You are shown how the mkdir command works in Part 2 Step 1. You can create these three directories using mkdir three times, or by issuing it one time with three directory names.
It’s ok to ask for help, but don’t just ask for help on every step. You will learn more if you try things. You can’t break anything, and you can start over as many times as you like.