For several older versions of Windows the Swapfile/Paging file/Virtual Memory was recommended in Help to be 2.5 times the physical RAM then the last 2 or 3 versions it dropped to 1.5 times the RAM. Large spreadsheets, video editing, etc., could use more. For most consumers the default setting works fine.
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One thing I pay attention to is having at least 20% free space on the drive. To help in accomplishing that I store most of my data, downloads, etc., on a 4TB NAS drive, 2 x 4TB drives set as RAID 1 for total 4TB capacity.