In system administration, manual tasks need to either be automated – ideally put into Infrastructure as Code (IaC) – or documented. Good documentation is hard to write and time consuming, so in the heat of the moment while you're debugging things, you could instead simply write down what you did into an admin log.
Document what you did, why you did it and check it into Git so others can see.
Copy and paste commands you used directly into some text window.
Afterwards, you can have an LLM try to come up with a first draft for documentation which you should refine.