Let us start with another question,
why would you want to explain it to other people?
When I started out, I felt like this was a revelation that people had to know about, and I used it for everything. Grocery lists, phone numbers, names, to do lists, you name it and I have probably memorized it at some point. Why? I was enthusiastic.
Now I use mnemonics relatively little. I use my phone to memorize phone numbers for me, I returned to my old to-do notebook, all because it works better. I enjoy building memory palaces, I enjoy memorizing information, but if I also appreciate external mnemonic devices like pen and paper.
The drive to tell people about it is also gone. People don’t want to start mnemonics like we do, they just want to live in a certain way:
Happy.
When people ask, I can tell them. But I mainly stick to “oh you know, when I hear something I focus on listening in and see it happening in my mind, it makes it easier to remember.” The memory palaces, pegs and whatnot is never mentioned, they don’t care to hear it. And if they do care to hear it, they will continue asking. I open the door a little, give them a peek, and as they want to know more, I will slowly open the door further.
The only time I will right away explain how it is done is during my presentations on how different approaches are not by definition worse. After I let the audience shuffle a deck of cards and I show that I can memorize them in 40-something seconds (I let them time it too). Even then I don’t just mention all the cards, I mention a few, and then mix it up. Allowing them to split the deck or pull a card out of the middle, where I use only my memory of the deck to call out cards in a creative way. Then, and only then, do I explain how I do it right away.