Here’s how I look at it……..
If someone put out an instructional video on YT for a particular type of head…….something about 20-30mins long, that covered all the basic do’s and donts……that should be all the info someone should need to be able to make worthwhile gains.
If they don’t feel comfortable diving in after that level of instruction……..they should probably pay someone to do it.
Of course, a book would suffice as well………but with todays technology…..the YT video if far easier to bring to the public.