Personally, I have one for my system and utilities (QT etc), one for applications in general (including internet stuff), one for games, and one to dump everything else on, including personal files. I suggest you make the system partition the first one, application 2nd one, and so on, because the further out a partition is, the slower it is. Just a recommendation as you asked.
(having utilities w/system will enable you to scan/optimize all other partitions, and if you crash bad, it generally only trash that partition...whatever you do, DON'T keep personal files on your OS partition)
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