You'll be happy to know that the UI really doesn't change between 2.9 and 3.0.  Only a few of the render features, modifiers, and geometry nodes are updated.  Olav3d has an excellent video where he talks about 2.8 and 2.9 tutorials vs. Blender 3.0.  Once you get comfortable with 2.9, moving to 3.x will be extremely easy compared to the jump from 2.79 to 2.8 or higher.

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