Watch the 2 tutorials listed below, and follow along. I don't mean you have to recreate the scenes exactly, but as the speaker demonstrates tools, test them out yourself. That's the only deliverable for this assignment, but by the end you should be familiar with:
The palette layout, and how to save a palette
How to use the fill and paintbrush toolÂ
How to practice adding shadows where appropriate, including altering opacity
Get in the habit of putting different colors/ lines on their own layers (columns)
Tutorials:
How to Shade like a Pro in OpenToonz (up to 5:22, you don't have to get into effects yet.)