Questions & Answers about Я учусь шить.
Because учиться means to learn / to study, while учить usually means to learn something by studying it or to teach.
So:
- Я учусь шить = I am learning to sew
- Я учу русский = I am studying/learning Russian
- Я учу детей = I teach children
In standard Russian, if you mean I am learning to do something, you normally use учиться + infinitive:
- учусь готовить = I’m learning to cook
- учусь водить = I’m learning to drive
The -сь is the reflexive ending, from -ся / -сь.
The dictionary form is учиться. When you conjugate it:
- я учусь
- ты учишься
- он/она учится
This reflexive form is part of the verb itself. You should learn учиться as a whole verb, not as учить plus some extra word.
In this sentence, учусь means I am learning / I study.