[mariusor]

> (I had to stop at 17 o'clock) to find out that I'm running a microservice in a Docker Container and the changes I made on a mail template had no effect, when I send them, since I was working on local files. I feel myself an idiot and can't tell anyone

This is not your failure. This is your team's and your manager's failure. They should be aware about your knowledge levels about the application you're working on and provide this kind of information before hand instead of leaving you flailing around. I would be more upset at them than at yourself, but sadly a lot of senior developers have the empathy of a bag of bricks.

Don't be ashamed of the amount of time it takes you to find solutions, acquiring knowledge is not always a straight path. The important thing is that you learn.