I feel like this video could have used a preface on what displacement maps are in actual practice, before delving into ten minutes of tutorial.
I was confused and lost from the get go as Mr. Abbitt delved deep into the process, only to get the main point at the very end of the lecture. There also was an issue with not being able to assign Displacement options in the wrong rendering engine (eevee) which should be noted on the video. Took me a while to figure this out.