For me personally as a lecturer or trainer, the most important is a constant balancing act. It's tempting, as someone passionate about a subject, I want to share everything that's fascinating. But the reality is, students have limited time and focus. Overloading them with irrelevant information can actually hinder their understanding and retention of the core concepts. Sometimes, the most impactful learning happens when we're laser-focused on what you need to know to succeed. The AT&T example show how much time and effort can be wasted and how much more effective learning can be when we prioritize that 'need to know' over the 'nice to know'.