English uses commas more liberally than many languages. None of the commas OP used are particularly surprising, but some of them would be considered improper i

English uses commas more liberally than many languages. None of the commas OP used are particularly surprising, but some of them would be considered improper in more formal contexts. They are used to delimit the boundary between dependent and independent clauses, as in my previous sentence. They are also used around some kinds of parenthetical remarks, like this one, or to separate an initial prepositional phrase from the subject of the sentence (“In Greece, we have”). They should not appear between subject and verb (“Readable code, is...” or “let me, tell...”). It’s been a long time since I got this stuff in school, so there’s probably a lot of subtleties I’m forgetting.