Breakdown of Babcia zawsze wkłada fartuch, kiedy piecze ciasto dla gości.
Questions & Answers about Babcia zawsze wkłada fartuch, kiedy piecze ciasto dla gości.
Babcia is the subject of the sentence, so it is in the nominative case. It means grandma / grandmother.
It comes first because that is the most neutral word order here: first the person, then the adverb, then the verb.
Also, Polish has no articles, so Babcia can mean Grandma, the grandmother, or just grandma, depending on context.
Zawsze means always. It tells us this is a habitual action, not just something happening once.
In this sentence, Babcia zawsze wkłada fartuch sounds very natural:
Grandma always puts on an apron...
Polish word order is flexible, so zawsze can move, but its position changes emphasis. This version is the most neutral and common.