What is a prime minister’s responsibility ?

I think that their responsibility is to take care if their countr.Also they chose to do this because they d coded through they wanted to run for prime minister so if the don't do a good job the it is nobody's fault they were the ones who decided they wanted to do this with their lives not us. Yes we are the ones that voted for them , but we wouldn't have to vote for them if they didn't run for prime minister

This is me trying to say that leaders can't run for something that they know have a big responsibility and then when they get elected they don't take care of that responsibility.This also shows that they can't use their power against their responsibility.