As an office temp, the biggest challenge is getting placed into a new role and having to learn the details of how to do that job on the fly. Sometimes with no training; sometimes with training with very minimal.
I learned to take a lot of notes and referred back to them often.
One of the greatest challenges in my career has been inequality and unfairness. Giving specific consideration a group of people because of their connection has been challenging to me.
Some common challenges faced by professionals in various fields include time management, dealing with uncertainty, work-life balance, and staying updated with evolving technologies.