I've been working at companies that do sensors and board control, but when I tried to change jobs, there were a lot of robot companies. It seemed like Qt was basically necessary for most of them, so I took the course and it was good :) I've only made Qt once with Python, but honestly, I wasn't confident that I could do it well if I was asked to make it with C++. I thought I should learn it properly this time. It's not something that you can do by rushing and listening until the interview, but I'll listen hard and diligently and improve my skills :)