Agree with Omar. When it comes to the modelling course the biggest difference will probably be the shade smooth function. In older versions you’ll have to shade smooth, then go to the data properties under normals and make sure auto smooth is enabled.
Other than that I can’t think of much difference in terms of modelling. The tools used in the course are still the same, maybe a slight name change in the menus here and there. Lighting and materials will have more differences. For that you can always go back to the older courses too.
