W.O.W. Words of Wisdom

What are your Words of Wisdom (W.O.W.) for up-and-coming Learning and Development (L&D) Professionals?

I have 3 questions and would love to hear WOW from professionals at any stage.

1. What’s one thing you wish you knew when you first started (as an L&D Professional)?
2. What’s the greatest piece of practical advice you’ve been given (as an L&D Professional)?
3. What’s one book/curriculum piece that made all of the difference in your ability to train and develop others?