Everything in this course has been really good, and @Bas Rosario context engineering series is right up there with it! The quick card is practical. It gives you seven lines to write before you ask an AI for anything, a way to check what you're feeding it, and a way to test it. One line from it has stuck with me: lucky is context you never wrote down. So I went back through a weekend of my own prompts to see which lines I actually use. What I was doing before. I always said what I wanted. Most of the time I said why, and where the files were. Sometimes I said what was off limits. What good looks like, I gave as adjectives. I told it to make things "awesome" or "bulletproof," and the AI can't see an adjective. What bad looks like, I never gave up front. I gave it three times in one weekend, but only as corrections after a draft came back wrong: don't name where I work, don't introduce me to people who already know me, and don't make it sound like I walk into a client with a solution already picked. Bas bet that line seven is the one most people skip. He was right about me. What I did about it. I wrote one room for the prompt I use most. Those repeat corrections are now line seven, each with one line on why. Then I tested it the way the card says, in fresh windows. Without the room, the answer sounded good but filled the gaps with things that weren't true. With the room, it left blanks where only I knew the answer. The test also showed the room wasn't perfect. One of my rules was too strict and blocked a check I needed, so I fixed it and saved a second version. What I'm going to do next. Write line seven before the first draft, not after. Replace my adjectives with a real example or a check you can pass or fail. Build a room for the next prompt I use a lot, and keep adding the corrections to it so I stop repeating them. This is the kind of stuff I can really dig into. Thanks, @Bas Rosario