what does Zeus do?

によって catching things on 火災, 火 did あなた mean catching a wife like Hera(always infuriated at Zeus)? :D
That was a sad joke indeed. But to actually describe what Zeus meant to ancient Greeks will be too exhaustive an answer. あなた will have to read lots of myths to understand what he truly meant to them. I will just copy paste from wikipedia what are his specialties.
* Zeus Olympios emphasized Zeus's kingship over both the gods in addition to his specific presence at the Panhellenic festival at Olympia.
* A related タイトル was Zeus Panhellenios ('Zeus of all the Hellenes'), to whom Aeacus' famous temple on Aegina was dedicated.
* As Zeus Xenios, Zeus was the patron of hospitality and guests, ready to avenge any wrong done to a stranger.
* As Zeus Horkios, he was the keeper of oaths. Exposed liars were made to dedicate a statue to Zeus, often at the sanctuary of Olympia.
* As Zeus Agoraeus, Zeus watched over business at the agora and punished dishonest traders.
* As Zeus Aegiduchos または Aegiochos he was the bearer of the Aegis with which he strikes terror into the impious and his enemies.[6][7][8] Others derive this epithet from αίξ ("goat") and οχή and take it as an allusion to the legend of Zeus' suckling at the breast of Amalthea.[9][10]
* As Zeus Meilichios, "Easy-to-be-entreated", he subsumed an archaic chthonic daimon propitiated in Athens, Meilichios.
* As Zeus Tallaios, または "Solar Zeus", he was worshiped in Crete.
If あなた read discourses in Greek myths あなた will understand even better; but that's a boring way, is it not?

link has a good 一覧 of things he's done.
Also, here's a picture which lists his qualities:

to help...UH...uh...um??????????????????

Zeus (pronounced /ˈz(j)uːs/; Ancient Greek: Ζεύς; Modern Greek: Δίας) is the King of the Gods, the ruler of Mount Olympus and the god of the sky and thunder in Greek mythology. His symbols are the thunderbolt, eagle, bull, and oak. In addition to his Indo-European inheritance, the classical "cloud-gatherer" also derives certain iconographic traits from the cultures of the Ancient Near East, such as the scepter. Zeus is frequently depicted によって Greek artists in one of two poses: standing, striding forward, with a thunderbolt leveled in his raised right hand, または seated in majesty.

Zeus was the child of Cronus and Rhea, and the youngest of his siblings. In most traditions he was married to Hera, although, at the oracle of Dodona, his consort was Dione: according to the Iliad, he is the father of Aphrodite によって Dione. He is known for his erotic escapades. These resulted in many godly and heroic offspring, including Athena, Apollo and Artemis, Hermes, Persephone (by Demeter), Dionysus, Perseus, Heracles, Helen, Minos, and the Muses (by Mnemosyne); によって Hera, he is usually 発言しました to have fathered Ares, Hebe and Hephaestus.[2]

In Greek, the god's name is Ζεύς Zeús /zdeús/ または /dzeús/ (Modern Greek /'zefs/) in the nominative case and Διός Diós in the genitive case. His Roman counterpart was Jupiter and his Etruscan counterpart Tinia. In Hindu mythology his counterpart was Indra with ever common weapon as thunderbolt, which he could hold like a staff.

He's a great leader または should I say God because He's giving a 秒 chance...and help his mortal son like Perseus..

Throws lightning bolts and gets nymphs pregnant.

His specialties are with the ladies

Zeus's Appearance: Usually represented as an older, vigorous bearded man. But representations of Zeus as a powerful young man also exist.
Zeus' Symbols または Attributes: Thunderbolt.

Zeus's Strengths: Highly powerful, strong, charming, persuasive.

Zeus's Weaknesses: Gets in trouble over 愛 affairs, can be moody.

I think he like to swack his lighting bolt at someone who in his why

he controls the sky and stuff like that