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The basics for OpenCV 3: http://docs.opencv.org/master/d1/dfb/intro.html#gsc.tab=0
Tutorials to start of with: http://docs.opencv.org/master/df/d65/tutorial_table_of_content_introduction.html#gsc.tab=0
As to the python question, OpenCV can be installed with whatever Python version you want using the CMAKE approach.
