FreeBSD - man pages

FreeBSD and other Unix systems use man pages for system documentation, they are called by the man command. For FreeBSD the following are useful man pages:

• man firewall will give advice for building a FreeBSD firewall
  man hier will explain the way FreeBSD filesystems are normally laid out.
• Man pages are divided into section depending on topic. There are 9 different sections numbered from 1 (General Commands) to 9 (Kernel Developer’s Manual).
  You can get an introduction to each topic by typing man <number> intro In other words, to get the intro to general commands, type man 1 intro
• man ports gives many useful hints about installing FreeBSD ports.
• man security gives very good advice on how to tune the security of your FreeBSD system.
• man tuning gives some tips how to tune performance of your FreeBSD system.