I actually would advocate that it's good to make mistake on other people's codebases.
I mean: I've made lots of mistakes in my own personal projects, and had lots of bugs that I learned from.
But the mistakes where I truly learned a lot are the ones where I was working on a company's codebase on critical code and then I badly broke it.
I've had some bad moments where I broke important things that probably cost the company money. But after the momentary stress, (and especially in retrospect now that I no longer work for them) those mistakes turned out to be pretty insignificant in my overall career.
And those mistakes taught me the most.
So don't worry so much about breaking code, even if it's your employer's codebase. The more critical and important the code, the bigger the opportunity to break it and learn something!
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I actually would advocate that it's good to make mistake on other people's codebases.
I mean: I've made lots of mistakes in my own personal projects, and had lots of bugs that I learned from.
But the mistakes where I truly learned a lot are the ones where I was working on a company's codebase on critical code and then I badly broke it.
I've had some bad moments where I broke important things that probably cost the company money. But after the momentary stress, (and especially in retrospect now that I no longer work for them) those mistakes turned out to be pretty insignificant in my overall career.
And those mistakes taught me the most.
So don't worry so much about breaking code, even if it's your employer's codebase. The more critical and important the code, the bigger the opportunity to break it and learn something!