Ursula K Le Guin's novel "The Disposessed" https://en.wikipedia.org/wiki/The_Dispossessed features a society which is anarchic in that there are no laws. Of course the society needs structure to function, since mining, trucking, agriculture and other expected industries exist and function, so while no coercive government exists, other forms of authority do. She considers the same questions as above throughout the book, and it really is worth a read.
I will give some spoilers that touch on key points:
Since there are no laws, social pressure and violence are used to settle disputes:
The man named Shevet came up to Shevek one night after supper. He was a stocky, handsome fellow of thirty. “I’m tired of getting mixed up with you,” he said. “Call yourself something else.”
The surly aggressiveness would have puzzled Shevek earlier. Now he simply responded in kind. “Change your own name if you dont like it,” he said.
“You’re one of those little profiteers who goes to school to keep his hands clean,” the man said. “I’ve always wanted to knock the shit out of one of you.”
“Don’t call me profiteer!” Shevek said, but this wasn’t a verbal battle. Shevet knocked him double. He got in several return blows, having long arms and more temper than his opponent expected: but he was outmatched. Several people paused to watch, saw that it was a fair fight but not an interesting one, and went on. They were neither offended nor attracted by simple violence. Shevek did not call for help, so it was nobody’s business but his own. When he came to he was lying on his back on the dark ground between two tents.
He had a ringing in his right ear for a couple of days, and a split lip that took long to heal because of the dust, which irritated all sores. He and Shevet never spoke again.
Industrial technology is maintained:
PDC, the principal users of radio, telephone, and mails, coordinated the means of long-distance communication, just as they did the means of long-distance travel and shipping. There being no “business” on Anarres, in the sense of promoting, advertising, investing, speculating, and so forth, the mail consisted mostly of correspondence among industrial and professional syndicates, their directives and newsletters plus those of the PDC, and a small volume of personal letters. Living in a society where anyone could move whenever and wherever he wanted, an Anarresti tended to look for his friends where he was, not where he had been. Telephones were seldom used within a community; communities weren’t all that big.
Children are usually abandoned to dormitories to avoid instilling propertarian values:
“You know, I don’t agree,” he said to long-faced Vokep, an agricultural chemist traveling to Abbenay. “I think men mostly have to learn to be anarchists. Women don’t have to learn.”
Vokep shook his head grimly. “It’s the kids,” he said. “Having babies. Makes ‘em propertarians. They won’t let go.” He sighed. “Touch and go, brother, that’s the rule. Don’t ever let yourself be owned.”
There was silence again, and Rulag said in her controlled, pleasant voice, “Well, yes; it mattered, and it still matters. But Palat was the one to stay with you and see you through your integrative years. He was supportive, he was parental, as I am not.
It is yours, isn’t it? Why else would Sabul be co-publishing with a twenty-year-old student? The subject’s beyond me, I’m only an engineer. I confess to being proud of you. That’s strange, isn’t it? Unreasonable. Propertarian, even. As if you were something that belonged to me! But as one gets older one needs certain reassurances that aren’t, always, entirely reasonable. In order to go on at all.”
A loose marriage like arrangement exists, but is considered slightly propertarian.
“Talk? It’s not talk. It’s not reason. It’s hand’s touch. I touch the wholeness, I hold it. Which is moonlight, which is Takver? How shall I fear death? When I hold it, when I hold in my hands the light —”
“Don’t be propertarian,” Takver muttered.
“Dear heart, don’t cry.”
“I’m not crying. You are. Those are your tears.”
Sexual norms are much looser (not quoted :-)
Religion is known but formal practice is discouraged:
“Why, because you’re an Odonian from Anarres — there’s no religion on Anarres.” -
“No religion? Are we stones, on Anarres?”
“I mean established religion — churches, creeds —” Kimoe flustered easily.
But not having laws doesn't mean that people don't have very strong prejudices that have the force of law:
“You’re not worthy to say the name of Odo!” the young man shouted. “You’re traitors, you and the whole Syndicate! There are people all over Anarres watching you. You think we dont know that Shevek’s been asked to go to Urras, to go sell Anarresti science to the profiteers? You think we don’t know that all you snivelers would love to go there and live rich and let the propertarians pat you on the back? You can got Good riddance! But if you try coming back here, you’ll meet with Justice!”
He was on his feet and leaning across the table, shouting straight into Bedap’s face. Bedap looked up at him and said, “You dont mean justice, you mean punishment. Do you think they’re the same thing?”
“He means violence,” Rulag said. “And if there is violence, you will have caused it. You and your Syndicate. And you will have deserved it.”