The generic "knowing" of a technology isn't owned by anyone and good luck proving you DO own the "knowing" of something. Because if that's the case we would be falling down a rabbit hole of knowledge... At some point the knowledge is what is is.
As long as you use no resources or concepts attached to your work to demonstrate or teach the technology, that's fine. However, if the company pays you to build a wiki of links of sorts, that cannot be shared. Even though that's publicly available, you can't just share that.
So, you can share the knowledge, sure. But ANY resource that is an aggregate of the effort that is paid for by the company or developer while you work for them belongs to them.
For example, if you have an excel for your dev team with all the links you found with all the resources to learn with notes and bullet points and images. You CANNOT share that.