Work through this text tutorial to throw an animal a birthday party. Your teacher may work it through with you or you can try it on your own.
Along side this tutorial it can be very useful learning some shortcuts to the software. Some basics are:
Left-click: Action
Middle-click: Pan Canvas
Right-click: Menu
Ctrl+Scrollwheel: Zoom Canvas
A more complete list that can be useful to print out is here
This is a written tutorial getting you started with some of the basics of GIMP. In particular this one teaches you about Layer Masks and drawing using the paintbrush, and paintbucket.
Use one of the tutorials below for you next piece and learn some new skills and practice the ones you already know.
GIMP Photo Editing: Create a Photo Blend with the Gradient Tool
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Turn Any Photo Into a Cartoon in GIMP
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Create a Double Exposure Effect in GIMP 2020
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GIMP Tutorial: Transform Face into Galaxy Silhouette
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Creating hybrid animals
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GIMP Tutorial: Slice Effect
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GIMP Tutorial: Text Portrait
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GIMP Grime Art Tutorial
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Make Yourself Float Photo Composite Manipulation in GIMP
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GIMP Tutorial: Disintegration Effect
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GIMP for Beginners: Light Bulb Fish Bowl Tutorial
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Turn Photos Into Logos with GIMP
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Trendy Line Art Photo Trace and Masking
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GIMP in Less Than 10 Minutes: Beginners Guide
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All 39 GIMP Tools Explained
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5 Ways To Remove A Background with GIMP
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GIMP layer tutorial