Practically speaking, all is under root or '/', doesn't really matter which partitions they are, just where and how they are mounted.
In general, binaries, and libraries for packages are under /usr. home directories are under /home ('cept for root users's home which is - wait for it... /root). My logs and mail/fax live under /var.
Again the confusion arises out of the 'root' user or group (root), 'root' of the filesystem (/), and the 'root' home (/root). Common mistake.
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