It is an enormous waste of time to know the majority of features of most packages. Some packages that are "the standard", you will know more than others, but st

It is an enormous waste of time to know the majority of features of most packages. Some packages that are "the standard", you will know more than others, but still far from memorizing most of the functionality. It's just not worth the time. You should focus on the underlying languages since they transcend packages.