Learning is characterized as "any relatively permanent change in behavior that occurs as a result of experience". This also means that it also happens outside of schools, e.g. at workplaces.
Give us an example of such a "lesson" that helped you to improve your job performance.
Try to generalize this isolated experience of yours into a "training method" that would help others to improve their performance as well.
Improving public speaking, through the deletion of fillers, is important to many people. The use of fillers when speaking is a common problem. This solution gives guidelines to make improvements in how someone speaks professionally by getting rid of the use of fillers.