[caw]

Good list, I'd also say permissions. The number of problems I fix by understanding users/groups and assigning the appropriate permission (not `chmod 777 *`) is huge. It shows up in a variety of "Cannot access file" type messages or "File does not exist" application errors and people sometimes freak out because the file is there.

[himlion]

To be fair 'chmod 777 *' fixes those issues as well, just at a big cost to security.

[Jugurtha]

I don't know if "fix" is the right word. Chopping your right arm off "fixes" the itch, although you're literally giving your right arm.

[autotune]

Also relavent to permissions:

https://people.redhat.com/duffy/selinux/selinux-coloring-boo...

[punchclockhero]

Definitely. If something's not working in a Red Hat based distro, it's usually stopped by SElinux.

[zlynx]

And the right answer is never "Disable SELinux"