Short answer: the "magic words" era is over. The communication era isn't.
The tricks from 2023 — "act as an expert", "think step by step", elaborate incantations — are mostly built into modern models now. You don't need a course, a cheat sheet, or a €200 certification. Anyone selling you one is selling nostalgia.
What still separates good results from mush is embarrassingly ordinary: say what you're actually trying to achieve (not just the task), show one example of what "good" looks like, state your constraints, and treat the first answer as a draft to push back on. That's briefing a colleague, not engineering.
The best way to learn it is 30 minutes of real use on a real task. Pick the right tool to practice with — the quiz will match one to what you're trying to do.