My biggest struggle is knowing why a certain thing is done. I don't want to simply build on a layer of magic, I want to know why I am using a particular framewo

My biggest struggle is knowing why a certain thing is done. I don't want to simply build on a layer of magic, I want to know why I am using a particular framework or library. But without much experience having done it prior, it is hard to evaluate why the current trends exist at all.