Using the Recolor Artwork feature to quickly, easily and selectively recolor pieces strokes are fills in your composition is very efficient. It can also be very intimidating with all the features that is has. Here is a quick explainer on how it works and how it can work for you to quickly edit your color. See the video here.
Create linear and radial gradients to apply to shapes and see how the Freeform gradients can create smooth, contouring blends. For more interest, add gradients along strokes to create unique looks that you can't get from any other features. See the video here.
The Shape Builder Tool in Illustrator is remarkable for what it can do to build shapes. You may be familiar with the Pathfinder and its ability to add, subtract or knock out shapes but the Shape Builder Tool can do even more. Explore what it can do for you, especially when it comes to strokes. The results may just that "WOW" moment you needed in shape construction.
See the video here.
Illustrator has had Clipping Masks for many version but many people stumble through it or have their own quirky methods of making things mask correctly. You want to learn ALL the ins and outs as well as this Draw inside method? Watch this video and see how cool this can be.
The Direct Selection tool is a surprising and bewildering tool to select points and manipulate shapes. I will show you how to use it like a pro, set the preferences so the points are easier to select and create open paths to use the Join feature. See the complete video here.