In my opinon it’s okay for you to use hotkeys, just explain what you’re pressing 
I found your use of hotkeys VERY helpful indeed. I really enjoy learning these shortcuts, because it will make my work in Blender really that much easier. It’s awesome for me to learn a few new things even at this stage in the course, since I have used Blender for some years now 
I agree, I am a big fan of keyboard shortcuts, but sometimes in the instructional portion of the video he is pressing a hotkey and the symbol pops up but I haven’t a clue what key it represents. IE: When he switched from object mode to edit mode there was an arrow key facing right with a line at the front of it. No idea what key that represents.