The number of programmers who practiced Object Oriented mainstream languages and don't know at least a single item in list and are extremely effective is probab

The number of programmers who practiced Object Oriented mainstream languages and don't know at least a single item in list and are extremely effective is probably close to the number of unicorns that exist in this world :). People don't just suddenly know how to write good programs. They read materials, they write code and continue to learn from other people. Sorry, I don't buy the myth and folklore. I used to about 3-4 years ago before I realized that many stories were hyped up.