What do you mean by one point lesson term?

This one point lesson is primarily used in increasing communication. One point lesson is a communication on a brief Standard operating procedure or SOP, it is used to communicate to operators and staff new or revised standards or work methods that are simple and do not require a full SOP.
A one point lesson could be as simple as communicating a new running pressure for a certain vessel, a 5s standard to be implemented in a work area, a new hand operated tool to perform a certain task, or even the relocation of a piece of machinery.