Hi! I think the course needs to be updated for the new blender version, cause I feel I won't understand anything at all.
Hello. Yes, it's an old course. Usually people that are more comfortable with Blender have no trouble watching older courses, but if you're brand new it's better to first focus on newer courses and then once you're comfortable you can watch the old ones, because they are filled with timeless knowledge, even though the UI may look different.
These older courses are still hold a significant value in learning knowledge in terms of 3d modeling and practicing skills.
There is more to learning 3d than just the software, the only real change in these courses is Blender's UI and some hotkeys.
Like Omar said, when you are comfortable with Blender, lessons can still be learned from older courses.
We have plenty of courses to get you up and running with modern Blender,
blender-3-basics-intro-to-blender
press-start-your-simple-first-blender-project
rev-model-a-low-poly-muscle-car
You can always download the version of Blender used in the course
blender/download/previous-versions