1. Small actions compound. Don't let small basic mistakes sabotage your reputation because it only takes a few small snafus for people to lose confidence/trust in your ability to do more important tasks. Trust is a fragile thing and the sooner people can trust you the faster they'll give you more responsibility.
2. Rising tide lifts all boats. No matter how talented you are it's a lot harder to break out in a sluggish situation/hierarchy/economy than a go-go environment. talent still matters but people generally overweight individual talent and underweight economics when evaluating/explaining their career successes.
3. Seek opportunities where the outcome is success or failure. Nothing in between: You don't become a star doing your job. You become a star making things happen. The most you can learn are 1) rapidly growing organizations or 2) failing organizations.
4. Career Tracks & Meritocracies don't exist. Your career is not a linear, clearly defined trajectory. It will be messy and will move more like a step function.
5. You'll only be known for a few things. Make those labels count: People rely on labels as quick filters. Keep this in mind when you pick an industry/company/job role/school because it can serve as an anchor or elevator in the future. It's unfortunate but that's the way it is. You should always be aware of what your "labels" are.
6. Nurture & protect your network and your network will nurture & protect you. Pay it forward and help people. Your network will be one of the biggest drivers of your success.