One of the more odious tasks for me, as a digital sculptor, is tank tracks.
I can do them in my sleep, now, but at first, they were no fun. Plus, they used to crash my more feeble sculpting computers, leading to much frustration.
I still carry some of that residual hate. Damn you, tank tracks. ;)
Now, I'm not going to get technical on you. There are various types of suspensions, wheel and sprocket arrangements, and tread types. You can research that on your own. Here's a good start...
Everything Is In The Suspension
Sherman Road Wheels
M1 Abrams Suspension
Leopard 2 Suspension
WW1 Tank Suspensions
As you can see, there's a variety of approaches. The simplest is the type used on the early British tanks in The Great War, and which has been emulated in WH40K Imperial Guard Designs and some charming Alternate WW1/Martian Invasion games for their steam tanks.
I work in Rhino3d, so adapt to your program and work process as necessary.
This is what I call my Main Reference Line. Remember that.
You can put armored skirts over the top of those tread links on top, you can add any variety of rivets and surface panelling to it. This is just a simple tutorial on making WW1 style tread units. More advanced stuff later.