to partition, or not partition... for macOS?

[zoran]

When installing a macOS, to a 1TB drive, I was thinking that it might be an advantages to partition the drive into two, so that the 1st partition is 100GB and the 2nd 900GB. The purpose -as i think of it- is to have the OS in its dedicated partition and keep the users working files to a different. Correct me if im wrong, but I would prolly keep the 1st partition so that i can install there only OS files, apps etc. and erase it anytime i wish to upgrade to the next OS, without touching the files on the 2nd partition.
Let me know your comments. Btw, not that it matters, but just to let u know, i can only install HSierra cause my iMac is an ancient but still worthy 27" mid2010 corei7

 

[Strategia]

Recent macOS versions already use APFS containers to separate the system volume and your data.

 

[zoran]

Is this sorting visible?

 

[Strategia]

If you open Disk Utility and press "Show All Volumes" you should see one partition with your volume label (typically Macintosh HD), and one partition with your volume name and "- Data" attached to the end of it.