i don't know about the language barrier but i'd highly recommend both DM袋喵 and i调调i on bilibili!!!
the former is incredible at posing/anatomy with a unique (and crazy efficient??) drawing method, while the latter does "art fixing" tutorials featuring a variety of skill levels
Honestly, thinking back, this is more of a step-by-step process TT I'm a bit hesitant to do actual object rendering tutorials since I'm not even sure if my knowledge is 100% correct. It's all just stuff I learned from experience and self-teaching. Hope it helps though!
The 3 layer modes I mainly use are Multiply, Overlay, and Screen. Multiply is for blocking in the overall light and shadow, Overlay to punch up the colors in illuminated areas, and Screen for glowing effects. If the object has a really strong glow, I might add a Color Dodge layer