DoGA CGA comes in easy to digest lessons. They are cleverly named L1, L2, and L3. L1 covers the very basics of 3D object placement, rotation, and scaling. L2, adds textures, materials, and multi-jointed models. L3, include support for custom backgrounds, textures, parts, and additional tools for animation, texture coordinate editting, etc.
L1 and L2 have English language help files. L3's help files have not all been converted to English. I do have some of L3's help files converted on my DoGA support page. Mainly the one for the Parts Assembler which is the biggie.
All three versions are free to download and use. L2 and L3's will not render movies unless registered. But, that doesn't stop you from using it as a game model creation tool. All version export Direct3D .X files and I believe both L2 and L3 have a triangulation option for those of you using DBP 5.2.
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TAZ