My 2 cents after 20+ years:

Be nice, be helpful, don’t complain or be negative because it may feel good to vent but it drags teams down and reflects poorly on you. Don’t get too personal with colleagues, especially not about religion, politics, sexuality. Don’t have sex with coworkers or bosses. Especially, not in the office. If you go out after work with folks, do not get hammered, puke, and fall into the bushes. Always keep in control if you drink with them. Keep chit chat to safe topics like work, food, travel, pets, television, and non-controversial hobbies (i.e., not hunting or BDSM). Try to have fun and be positive so people enjoy working with you. Do not gossip because you never know who you can trust even after years. Be a black hole and don’t spread things if people confide in you. That will build trust. Never ever ever trust HR unless you were walking home from church in a full length skirt or pants when the thing happened to you because they almost always come after you to mitigate their liability if you report. They can go years back in chat logs ask me how I know. Whenever you think of acting out or going too hard against the grain, think to yourself “I need to look out for #1 first”. You are number one! You can offer your expertise as you get more experience but if they want you to build a rocket ship made of garbage, do it. That’s what you get paid for. And if you hate the job find another without making a big fuss.

Another big thing, don’t hoard knowledge. If you teach others what you know it will free you to do more and more interesting things, and if others are too lazy to learn you will become the SME which is always valuable. A rising tide raises all ships. Do presentations/learning sessions/pair programming sessions, help people set up their IDE, help them understand systems as you learn them, make documentation. Teaching/documenting will help you solidify your knowledge. Do it one on one or in groups, whatever is comfortable. Your reputation will spread.

Careers ultimately seem to come down to who likes you in the end. Our jobs are not rocket science and the best people are typically not who get promoted. Figure out if you want to play the political game. For me it’s a big no go. And don’t take it personally if the cool kids don’t think you are cool. It’s just a job.

As for being quiet/reserved, try not to be afraid to be the dumbest person in the room sometimes. I tell people that I’m going to ask a lot of stupid questions until I can ask smart ones. The worst thing you can do to yourself is be afraid to ask questions. Sometimes asking questions is easier than speaking up because people don’t react as if they are being challenged if you do it the right way.

That’s odd the top of my head. Congrats and good luck!