Is the major role of the stomach digestion?

Answer 1

No. The stomach absorbs no food, but rather breaks it down into smaller pieces via mechanical digestion and chemical digestion. Long story short, once it travels into the jejunum and the ileum (aka the small intestine) then nutrients are absorbed.

Answer 2

No. The bulk of absorption takes place in the intestines.
No, barely any absorption occurs in the stomach. Most of it occurs in the small intestine. The stomach is all about breaking down the food into a liquid, called chyme [kahym]. It does this by churning the food in the stomach fluid with involuntary muscles (muscles that work automatically). This is called mechanical digestion, when food is physically broken down. The stomach's fluid is mainly made up of pepsin, which chemically breaks down proteins in your food, and hydrochloric acid, which kills harmful bacteria that could be in your food. Pepsin works best in an acid environment. What the hydrochloric acid and pepsin do is called chemical digestion, when food is digested with chemicals.