There are too many life skills, such as planting, fishing, herb picking, mining, pharmacy, cooking, pharmacology, health preservation, casting, sewing, jewelry making and seiko. I don't remember these details clearly. Planting level 20, fishing level 20, herb picking level 20, manual sewing level 40, and life skills of sects. There is no grade limit.
There are too many skills, and the upgrade requires different levels, but skills above level 50 can be upgraded to the top.