New to IT and Curious About Necessary Software/Hardware

I'm new to IT but have a background with computers and some coding. I'm trying to get into it by studying up for my A+ and maybe ITF+. Also looking at MCSA and CISSP. I'm just curious as to how crucial it is to be well rounded using all three of the OS'. I know windows relatively well and somewhat for Linux but I don't know all that much about mac OS. So I'm curious as to what are some necessary items that would pertain to the job whether on the field or in an office environment. Especially if I should invest into a macbook/ mac mini, to get my feet wet with the OS on an everyday basis type of feel. Appreciate any help and advice and thanks for reading!

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