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I read somewhere that to keep my MacBook working fast I have to do a cleaning or something similar. How do I determine what files to delete and what to keep though? I don't know much about how computers work.

Good morning everyone. I just bought my first Mac, and the transition came with some unexpected problems. One that pisses me off particularly is inability to play videos and other media files that I transferred over from my previous PC. I'm really frustrated by this…