Please watch this: https://www.youtube.com/watch?v=QPKKQnijnsM
And this: https://www.youtube.com/watch?v=acLW1vFO-2Q
And this: https://www.youtube.com/watch?v=iFDe5kUUyT0
And this: https://www.youtube.com/watch?v=tGk5ioEXlIM
And this: https://www.youtube.com/watch?v=TZU3wfjtIJY (but only if you're mature enough to handle a proper academic lecture)

Especially if you're reading this from the USA.