Why are there so many different types of motherboards?

This is my first year of being an IT student and in class our teacher showed us one kind of motherboard and it was really difficult to learn THEN the next couple of weeks studying it. She gave us a test on some random motherboard and the whole class flunked it. What can I do to remember all the different types of... show more This is my first year of being an IT student and in class our teacher showed us one kind of motherboard and it was really difficult to learn THEN the next couple of weeks studying it. She gave us a test on some random motherboard and the whole class flunked it. What can I do to remember all the different types of motherboards inside a desktop, laptop and the central processing unit
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