Teaching made one idea especially useful to my work with technology: understanding is something a learner demonstrates, not something a presenter declares.
A long walkthrough can feel complete to the person delivering it. The learner may still be unsure how to perform the first task on their own. I try to begin with a concrete goal, show one workable example, let the person try, and give feedback that explains what to do differently.
For a new business system, that might mean practicing one common request instead of touring every menu. For a training course, it might mean a short decision scenario rather than another slide of definitions. The materials should be available afterward, in the language people use when they actually need help.
Adoption also takes follow-up. Questions that arise during the first week tell us which step needs a better example or a clearer instruction. The rollout is not finished merely because the launch meeting ended.