This month, I will release the 15th Anniversary edition of my first book, the bestselling They Don’t Teach Corporate in College.  I wrote the book when I was in my late twenties, and ever since then, I’ve learned a ton about what works and what doesn’t in the business world. Today, I’m sharing some of my recent insights.

No one cares as much about your career as you                                                                                                         

While your organization and your manager probably do have your best interests at heart, no one will ever put as much time and energy into your professional development as you will because no one benefits from it as much as you. So don’t be passive. Advocate for the best learning opportunities and experiences and be proactive about keeping your skills fresh.

Careers are peaks and valleys

Even if you were to stay on one career path, which is highly unusual these days, there’s no such thing as getting to the top of the ladder and staying there. Careers are very long, so you must figure out a way to remain relevant and engaged over time. Occasional momentum loss is normal, but you need to be able to recover.

Plan now for what you want later

When choosing a career, it’s important to think through what you want for your life over the next several years. For instance, if you’re a married 33-year-old hotshot at a Top 5 consulting firm and you travel every week, but you know you want to start a family soon, you might want to rethink your situation. A flexible career doesn’t happen overnight: the right steps must be taken early.

Don’t be your own worst enemy

Working 80 hours a week may appear to be productive, but inevitably you are going to run out of steam – and that moment won’t be pretty. Instead of burning yourself out trying to be the best at everything for everyone, focus on a few key priorities, work to accomplish them when your energy is naturally highest, and let other people help you.

You won’t be everyone’s best friend

No matter how pleasant you are to be around, someone at work will find a reason to dislike you. They may be vocal about it, which can be hurtful. But personality conflicts are a part of working life. Don’t let them negatively impact your self-esteem. After trying once or twice to assertively resolve a co-worker conflict, move on to someone who values and appreciates you.

Nothing shows what you’re made of better than a crisis

We spend our working lives trying to avoid crises, but in truth, there are no better growth experiences and opportunities for your potential to shine through. The next time something bad happens, watch your attitude closely. While others are freaking out, maintain a positive, can do stance even if you’re annoyed or afraid. People will remember.

You can learn from any job

There are very few tasks with no redeeming value whatsoever. Even a cashier job at McDonald’s, for example, affords numerous opportunities to master critical transferable skills like customer relations, time management, and multi-tasking. Instead of lamenting that a task is beneath you, see what it can teach you to bring you closer to your big picture goals.

Know when to collaborate and when to go solo

We’ve placed a huge emphasis on teamwork in our culture, and it has permeated every aspect of the business world. You should, however, be able to discern when your projects require considerable input and consensus, and when you simply need to buckle down and push forward alone. It’s your job to add individual value to the organization – don’t let your creative and innovative ideas get lost.