Explain it to an audience.
It can be an audience of none.
Record yourself, talk to the camera.
It can be an audience of one.
Explain it to a friend, colleague, relative, or to your partner.
It can be an in-person audience.
Look for speaking engagements and get ready.
It can be an online audience.
Stream live. Share your camera and/or screen.
Explaining things, to yourself or to others, will make you learn more about them and interiorize key concepts, even when you don't fully understand them. That's the point.