This thread will attempt to provide a set of links which deal in all sorts of tutorials from mexing to texturing and modelling.
Note that some of these tutorials are based on older programs and thus may not work anymore. No responsibility is taken by myself, any other moderators, or this board for any confusion or hair loss implied or actually taken.
With that said, here goes:
General Modding Sites
Using Homeworld Modifications . A brief overview of the different files used by homeworld. Recommended to read first
mods.relicnews.com. Lots of different tutorials on all aspects. Recommended
Liflist tutorial by Crook. A tutorial explaining how to use Liflist to make the Homeworld's .LiF texture files
Modding Homeworld . A site that deals with building models for Homeworld using Truespace.
If you have any more tutorial sites please PM me.