How to divide extended partitions in LINUX9

How to divide the extended partitions in LINUX9-Linux general technology-Linux technology and application information. I read a lot of Introduction to partitions, but I still don't understand the partitions. This is where I use LINUX (Little Red Hat 9) with 40 Gb hard drive: 10 Gb for/partition (system display/hda1); 5 GB for/boot partition (system display hda2 ); the swap partition is also divided into 512 logs. I want to divide all the space into extended partitions, But how should I divide the extended partitions? Or to which partition is attached? (No matter how I divide systems such as/home and/usr, they are arranged in the order of hda3, hda4, and hda5. Is that true ?)

[ This post was last edited at, 01382140]