I’ve written up my advice (sprinkled with great advice from others), but this is way more straightforward nuts-and-bolts training on technical writing. It’s structured like an actual course, with exercises along the way.
I’m far from an expert here. But between Geoff and I, we end up doing a lot of technical article editing for the sake of clarity.
Comedy writers seek the funniest results, horror writers strive for the scariest, and technical writers aim for the clearest. In technical writing, clarity takes precedence over all other rules.
It can be tricky to get right. Read the section on Active voice. That’s easy for anyone to get wrong.
Essentially every single rule is just an extension of “make it more clear.”