>>105830115
>everything outside your home for is so opaque that if you're not really sure what you're doing
You're just a brainlet.
>/etc/
It's yours, go nuts, but don't be afraid of fixing init scripts from a live disk later if you fuck up.
>/usr/
Keep your shit in /usr/local/ and let the package manager do the rest. If you think you need to touch something in /usr/share you need to use the package config options.
>/var/
Write only, it's log files and sockets
>/tmp
Who cares, it's just lockfiles and shit that is destroyed on reboot
>/lib and /bin and /sbin
Follow the rules for /usr/ and in 2025 most distros force symlink those to /usr/ anyway.
>/boot
Go nuts and regenerate your menu.lst all you want. If you fuck up that's what live disks are for, or doing edit at grub and passing init=/bin/bash.