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I have noticed a certain phenomenon where people who are bad at something read books about it to compensate, and then having read books on the subjects start considering themselves experts on it and preach to others, closing the loop from descriptive to prescriptive.A motivating way to learn is to teach or re-iterate what you know, you learn new things that way. Going overboard or thinking you are a genius on the topic suddenly is annoying but sometimes it is how that person is motivated.
As far as sharing what people know through learning, that they previously didn't know and is interesting and fresh to their mind, that is part of their learning process.
Spaced Learning [1] + Spaced Repetition [2] are very effective learning/memory techniques, revisiting a topic many times over time.
Even commenting on topics you are into or researched on, simply restating them sometimes leads to learning more about it, at a minimum it sets it into your knowledge through repetition or spaced learning.
There is a fun spaced learning game using Spaced Repetition called How To Remember Anything Forever-ish [3].
Really both techniques just pattern-ize already existing techniques how people learn things through repetition and time. It is really just revisiting a topic in intervals that will put it in memory and make it important, which the brain will spend more cycles on, and new ideas and uses for that knowledge come up.
Talking or sharing what you know about what you just learned is part of that unstructured spaced learning/repetition that helps learn. It plays into presentation as well, when you are teaching a topic you start by summarizing, then get to the details, then resurface with the summary while hitting key points multiple times throughout. A teacher or presenter will learn more and more the more they repeat that topic/lesson etc that is impossible to get to on early iterations or draft/sketch phases.
[1] https://en.wikipedia.org/wiki/Spaced_learning
[2] https://en.wikipedia.org/wiki/Spaced_repetition
[3] https://ncase.me/remember/