One thing I do is ask the LLM to write me a walkthrough of the code. LLMs are pretty good at generating documentation like HTML slideshows or whatever else.

I mean, I've had useful software that I don't understand how it works where I am stuck hoping some small company continues to maintain it. And I've had some of those companies go out of business and leave me with useless software that I eventually have to replace once it no longer works on my machine.

Having the code that I can dump into an LLM to understand myself or have it alter it seems better than that.