In the company I work at I was assigned a task that requires the use of a particular software. During the research phase I found that there are very, very few tutorials on how to operate it. I have been self-studying the software and exploring documentation, which took me quite some time.
I had an idea that I could make tutorials on YouTube regarding this software, not regarding my assignment, but rather how to use generic functions and how to operate this software in general. I presented my manager with this idea, and he said he does not want me to do it, because then other people could learn how to use this software and make their own products.
Can he legally force me not to do this, if I use the knowledge I acquired during work, but the tutorials are not connected my assignment?
And in general - Is this a normal thing? And should I have even asked?