Video tutorials
A tutorial video from the official Daz Studio website www.daz3d.com/help/help-daz-3d-video-tutorials
Text tutorials
100 lessons with a detailed step-by-step description and lots of illustrations. On the same site you can find many asset reviews for Daz Studio: https://renderguide.com/category/daz3d-tutorials/
About 40 lessons about different techniques of artists' work in Daz Studio: https://www.thinkdrawart.com/category/daz-studio/