[TUTORIAL] Texturing your meshes without having “black lines” or seams

I’ve noticed quite a few meshes in-world often have black lines on their textures, either on the edge of the mesh’s UV seams, during download, or…
— Read on community.secondlife.com/forums/topic/419611-tutorial-texturing-your-meshes-without-having-black-lines-or-seams/

I struggle with unwrapping and texturing. So this is helpful.