Question: After graduating from university in the UK, I have heard multiple careers advisors say that it is inadvisable to leave your first career role before you have gained at least two years experience.

However I feel my current role is currently holding back my career progress as I am unable to properly learn industry standard technologies, and is affecting my health due to unbearable amount of stress caused by poor management.

I have worked nearly a year and a half at this company but it is still my first career job. Will this look bad to future employers? I work in a sector that currently has lots of job opportunities.

Answer: 
The problem is giving off the perception of someone who will likely ditch the job soon, for whatever reason. While you can usually explain the short stays during the interview, that's not much use if you don't even get invited to the interview due to the CV.

In your case it's perfectly fine to look for a new job. There are lots of bad jobs and everyone with some experience is aware of that.

**The problem comes after changing the job.** Now you've got one relatively short job on the CV, which isn't much of a problem. But if the new job sucks and you'll quit the new job or are let go after say 6 months, the combination of the 2 will look rather bad. If you stayed on for 2-3 years in the first job it's less likely that the 6 month job afterwards would be seen as a red flag.
Don't worry about it. If you receive an attractive offer take it. Lots of people are unhappy in their first job. But be careful not to just jump from one position to the next one that is slightly more attractive. Think about what you want and try to find a position that matches.