Entirely anecdotally, but that is what slowed me down the past few years. I am not in the industry at all (biologist), so I'm usually very late to development technologies. I tried to pick up Laravel about a year ago, and I just don't like learning from videos, so I tried to find a decent book to get started. Almost every book from O'Reilly has reviews that say the code examples are nearly unusable. I don't really want to spend the time troubleshooting their examples instead of using that time on whatever brought me to the framework in the first place.