The reasoning first, the buttons second.

Most planning gets taught as software training. You learn which buttons to press, and the thinking behind them is left for you to work out on the job, usually while someone is waiting for the programme.

This section goes the other way round. It is written for engineers early in their careers: people who have the degree, have the software, and have not yet had anyone sit down and explain why any of it is done that way. No account and no cost.

Most of what is here I learned on site from people who explained things they had no obligation to explain, usually while something else was waiting. This is a small return on that.