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Thanks Vincent

Она учит {кого-то} русскому.

Она обучает {кого-то} русскому.

So you could write in two different ways. I didn't know the word 'обучает'. I must look it up in my dictionary.
...

Are my Russian sentences fine?

она учйть русски. [ She teaches Russian.]

мариа учйть русски. [ Maria teaches Russin.]

Я видел Марию. [ I saw Maria.]