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Discussion in 'macOS' started by oro79, Nov 11, 2010.
What are the best free resources to learn OS X all the way to the advance level?
This should get you started: Helpful Information for Any Mac User
At the advanced level, the MAC OS X Reference Library can be quite helpful, possibly even for non-programmers.
Let's say, for example, you wanted to know how the system determines what programs can open which files:
Launch Services Concepts