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Macs are pretty intuitive and user-friendly so I think you'll manage. If not, most of the basic stuff is just a Google search away. I don't know if it's still a thing with new iMacs, but you might need to manually enable right-clicking in your settings. A couple of amazing Mac OSX apps I always recommend: Clear (todo list), OmniFocus, Pixelmator, Mailbox, Sublime for programming. If you work with MS Office files a lot, save yourself the trouble of exporting files and just get Office for Mac.