What is one thing you learned early in your career that you continue to use in your current job?

As a Product Designer, I'd say that having a good relationship with the Programmers Team is the key. Before I learned that, I used to overestimate the technical feasibility of some features I was designing, because I wasn't including programmers in design reflexions at all. On some projects, we had to initiate some major changes on high fidelity prototypes that were way too complex to code in a short period of time.

Write the system specs AND the User Guide and get them approved FIRST. Then build the system accordingly.

Communication is the most important skill and practice needed at any company. Without clear communication, you will experience frustration, lack of clarity, and most of all, the company won’t be successful.

It's easy to get lost in the finer details. Always take a step back and look at the big picture: Where is this all leading to? What can the customer do with this? Why do they need this? How will this all fit together from the customer's point of view?

That I was hired not for my hard skills, but for resolving customers' problems in IT on time and on budget. I wish more developers

I'm clinical psychologist and still applying the statement: I'm responsible for what I say no for what you understand or believe. It still helps in all post, comments and replies... nowadays most are lazy to read and try to understand or ask about what you don't really understand, but most are keen to refuse what you said without really got it