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I am not sure if I need a comma in "Хорошо, что я прочитал всю статью"? Can anyone shed some light here, please?
Хорошо is an impersonal sentence and it is a part of a complex sentence. You definitely need a comma before что.
Although there are some exceptions, in general you always need a comma before "что".
Я понял, что вы имели в виду
Он сказал, что не придет
Required, but never shown