I am working for about 10 years now: part time, project based, full time… and except the professional skills I have gathered I have also learned some additional things that will always serve my happiness:

• choose a job that you like. If you don’t find it, search again and again and again or just be easier to please
• always help you colleagues when they need you. We are all busy at work, that is why we are receiving a salary. We all have our extremely crazy days, weeks, our normal weeks and our thank you god, it’s Christmas time days. Be nice and helpful.
• never take holidays after a big project. Follow up takes longer than 2 weeks and most probably you will have to work during your holiday. Of course, you also have the option of just not giving a damn and then you will just be the guy that didn’t care
• if an email does not solve a problem, a phone call or a face-to-face meeting might be more efficient
• work hard because you are also working for yourself not only for your employer. It makes you sleep happier and easier
• make friends. You spend a 3rd of your life with your work colleagues, life will be better if you will also see your friends during that time
• never stop learning. School ends when you are in your 20s, the learning process should never end
• use bullet points. They are easy to follow