1. We put a comma when we are listing items in series.using commas in russian

Я хочу купить яблоки, бананы, апельсины и виноград.
— I want to buy apples, banans, oranges and grapes.

Usually we don’t have a comma before the conjunction «и» but sometimes it is possible. We have a comma, when it separates two independent clauses — if you can easily split the sentence into two separate ones.

Мой друг пошёл в парк, и там он увидел её.                                            — My friend went to the park, and he saw her there.

2. We put a comma before conjunctions «что, который, когда,  потому что, чтобы» etc.

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