Soft skills matter as much as technical skills (examples: communication, teamwork, good listener, learning to receive constructive feedback)
The learning curve may be steeper than you think (there is typically a significant gap between academic knowledge and practical application)
Deadlines matter
Speaking succinctly is important (examples: grammatically correct sentences, eliminating "um", "uh" and "like" from your vocabulary)
2 weeks may be the most time you can take off in a year
Your attitude matters
Office politics are ubiquitous (observe and listen as you build connections)
Great performance involves taking initiative
It's OK not to have all the answers
Don't waste time becoming great at things you hate