Before the "and", "but", "so", "while", etc. — while most European languages, indeed, (usually) require commas before conjunctions, English is following a somewhat reversed convention. Well, at least the author remembered that they need to omit a comma before "that".

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shakna 38 minutes ago | parent | next [-]

Apart from in Australian [0] and Canadian [1] English, where it is generally optional, but used where it can increase clarity or meter.

[0] Australian Government Publishing Service's Style Manual for Authors, Editors and Printers, ISBN: 978 0 7016 3648 7

[1] The Canadian style: a guide to writing and editing https://archive.org/details/canadianstylegui0000unse

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pipe01 an hour ago | parent | prev | next [-]

As a non-native English speaker I'm always so self conscious when using commas, it feels like I'm always using either too many or too few

	▲	john_strinlai 12 minutes ago \| parent \| next [-]
		i dont think anyone actually cares unless you are in english class or someone wants to feel smug on the internet (you can ignore the 2nd one completely).
	▲	zulux 15 minutes ago \| parent \| prev \| next [-]
		Don't worry about it. The lack or excess of commas doesn't upset any reasonable person in the slightest.
	▲	steele 28 minutes ago \| parent \| prev \| next [-]
		You're doing fine. English grammar pedants speak infrequently. Mostly due to the disinterest of the listener.
	▲	tenuousemphasis 34 minutes ago \| parent \| prev [-]
		As a native English speaker, same.

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sarchertech 26 minutes ago | parent | prev [-]

You do need a comma before a conjunction if it connects two independent clauses.

	▲	Joker_vD 10 minutes ago \| parent [-]
		So it's "You do need a comma before a conjunction, if it connects two independent clauses" then — "you need a comma before a conjunction" and "it connects two independent clauses" are two fully formed simple sentences, each having its own subject and predicate. See what I mean? And almost nobody writes sentences like "I love her and she loves me back" with a comma before "and".