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A few that come to mind:

1. You don’t know everything. Even if you disagree listen to colleagues that have more experience and try to understand their perspective of why they think a certain way.

2. I wasn’t as mature as I thought I was. I was actually fairly selfish and it wasn’t until I had kids that I realised true selflessness and putting others first. Along the same lines: pre-kids you don’t realise how much spare time you actually have all to yourself.

3. The speed of life. I feel like each decade speeds up - make sure you check in with yourself every year or two on your life goals and happiness and make adjustments or you might just find many years go in the blink of an eye.