You learn it better when you know you have to teach it.
The obligation to teach something changes how you learn it in the first place. It is one of the cheapest and most reliable ways to make sure a thing actually landed, for you or for anyone on your team.
The fastest way to learn something properly is to know, from the start, that you will have to teach it. It sounds like a trick and it is not. The obligation to teach changes how you pay attention while you learn, because you are no longer just trying to get it, you are trying to get it well enough to hand it on. That is a higher bar, and it pulls your understanding up to meet it.
The obligation changes the attention
Learn a thing for yourself and good enough is where you stop. Learn it knowing you must teach it next week and good enough moves: now you notice the edges, the exceptions, the why behind the step, because a learner will ask and you will have to answer. You are not learning harder. You are learning against a standard, and the standard is another person understanding it.
Two things it does
Teaching forces translation
To teach a thing you have to put it in plain terms, and the act of translating is what exposes the parts you did not actually understand. You cannot fake your way through explaining it simply. The gaps you glossed over in your own head become obvious the moment you try to make them clear to someone else.
Being taught means being critiqued
The flip side is just as useful. Letting someone teach you, or review your work, means hearing how it looks from the outside, which stings and helps in the same breath. Call your own baby ugly on purpose. The feedback you avoid is usually the feedback you need.
This is not the same as staying off the keyboard
There is a companion idea, that a trainer has to keep their own hands off the work so the successor actually owns it. That one is about the teacher restraining themselves. This one is the opposite lens: it is about the effect the teaching duty has on the learner. Put the two together and you get the full mechanism of how capability really moves between people.
How to use it
Assign the teach before the learning
Tell someone up front that once they learn this, they will teach the next person. The learning gets sharper because the finish line moved.
Make the SOP the exam
Have the learner write the process, or teach it back to you, as the test of whether they have it. If they can teach it, they have it. If they cannot, they do not, and now you both know.
So the next time you or someone on your team needs to learn something that matters, build the teaching in from the first day. The obligation to hand it on is one of the cheapest and most reliable ways to make sure it actually landed.
Trying to make capability stick across your team?
Getting knowledge to move from one person into the whole team, so it does not leave when they do, is a large part of what I do inside a business. The strategy call is free and it is a real diagnosis. If the timing is not right, the community costs nothing.