The OS and applications typically use less than 35G even on bloated Gnome-Ubuntu. Put everything else on the HDD, including the swap. Swap really should be on a slow spinning HDD so the user can "feel" the slowdown when RAM gets tight. That way, the user can close a bloated browser and free 50G of wasted RAM allocations from the browser bloat.
Put your HOME directories and /var/ on the spinning HDD. The installer has a "Do something else" option where that can be accomplished. Or there are how-to guides https://help.ubuntu.com/community/Pa...ng/Home/Moving and https://www.howtogeek.com/442101/how...er-hard-drive/ and https://www.tecmint.com/move-home-di...disk-in-linux/ are all reputable sources.
https://help.ubuntu.com/community/MovingLinuxPartition seems dated. I wouldn't use it, but it is there if you need it.
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