Eevee, Grease Pencil, and Geometry Nodes, you’ll definitely want to check out the older courses for. (I don’t even think 2.8 had Geometry nodes yet.. I think that was a bit later, but it does have grease pencil.)
There will also be some tools that are a bit different in their look or how they function, but for the most part, there’s a lot as far as modeling, shading, sculpting, rigging, and animating that haven’t changed very much in the last 7 years. If you have any questions, though, feel free to ask, but make sure you mention which version of Blender you’re using. Several of us might either sort of remember how it worked or have an older version we can reference to help out. Most of the courses usually mention either in the teaser or in the introductory lesson which version of Blender was used to record the video, so you can find the ones that will be most relevant to what you’re trying to do.
