
Dungeons & Dragons is more than its rules. Behind the d20 sit centuries of invented history, gods who answer their followers' prayers, dragons asleep on their hoard, and a handful of worlds tables have been passing around for fifty years.
Here is enough to find your footing without reading half a library: the multiverse and its planes, the great campaign settings, the peoples you will meet, the pantheons, the dragons, and above all how to use any of it at your table without drowning your players.
Dungeons & Dragons does not have one universe, it has dozens, tied together by the same architecture. At the centre sits the Material Plane, the one with the kingdoms, the taverns and the dungeons, where almost every session takes place. Around it turn the inner planes, made of raw elements, fire, water, earth and air, then the outer planes, home to the gods and battleground of the great moral forces.
Between the two lie the Feywild, a heightened and dangerous reflection of the known world, and the Shadowfell, its dimmed version peopled by the dead. That structure explains most of the rest: where summoned creatures are pulled from, why fiends and celestials are at war, and how a party crosses from one world to another without the system changing an inch.

Waterdeep, the Sword Coast, Baldur's Gate: this is the setting of most official adventures. Everything already exists there, so you create nothing.
Gary Gygax's world, drier and more political than the Realms. Dungeons are lethal there and factions matter more than heroes.
The Dragonlance world, written like a novel: a war, absent gods, dragon armies. Play it if your table likes a sweeping story.
Magic trains, newspapers and investigations in a city fresh out of a war. The best choice if you want noir rather than dungeons.
Sealed domains, each ruled by a cursed lord, Strahd among them. Ideal for a short campaign with a suffocating mood.
Galleons crossing the space between worlds, with their pirate crews. Bring it out when the table wants a change of air.
Seven hundred years of life changes how you see time and revenge. They do not sleep but meditate four hours a night.
Cities carved into rock, clan memory and grudges that last centuries. A word given is a contract.
Small, unobtrusive and impossible to frighten for long, they reroll their worst failures. Their communities live at the edge of the big stories.
Long reduced to enemy fodder, they are now a playable species like any other. Strength, endurance and a culture that is anything but uniform.
An infernal bloodline everyone can see: horns, a tail, eyes with no pupils. The character is often built on the suspicion they attract.
A reusable breath weapon, scales and loyalty to the clan above all. They make paladins and fighters you can read at a glance.

In the worlds of D&D the gods are not a matter of faith but an observed fact: they grant spells, send omens and compete for mortal attention. Every setting has its pantheon. The Forgotten Realms count dozens, from Tyr the just to Talos the storm, while Krynn organises itself around a far cleaner triangle of good, evil and neutrality.
For a player it plays out at character level: a cleric or a paladin picks a deity, and that choice settles their allies, their prohibitions and who opens doors for them in town. For the game master a pantheon is mostly a stock of ready-made factions, with temples, rivalries and reasons to hire the party.
Dragons give the game its name and its yardstick for power. They fall into two families. The chromatics, red, blue, green, black and white, are greedy and cruel, each with its own breath weapon and preferred terrain. The metallics, gold, silver, bronze, copper and brass, guard more than they plunder and readily take human shape to watch mortals.
A dragon ages in steps, from wyrmling to great wyrm, and its power follows the same curve: a young white dragon is a level five goal, an ancient red one the closing scene of a whole campaign. Their mythology goes back to Tiamat and Bahamut, the five-headed queen and the platinum dragon, whose feud sits behind countless campaigns.
One city and its surroundings will carry thirty sessions. Presenting a whole continent drowns the table in names it will forget.
Setting comes through what the characters see, hear and smell in the scene. A paragraph read aloud sends people to sleep, the smell of a forge sticks.
An abandoned temple is useless until somebody has a reason to walk in. Every piece of lore should produce a door, an enemy or a reward.
A birthplace and a faction give a character contacts, debts and enemies. That is what turns a setting into a personal story.
Official canon is not a contract. If a god, a date or a war gets in the way of your plot, change it and tell the table.
A wiki or one reference book avoids ten minute debates mid session. The rule: decide fast, check later.
A setting holds up when your players can see it. A map described three times out loud stays vague, while one displayed image and one music track put a tavern or a temple in front of everyone in seconds.
Tomeus gathers the backdrop, the music, the sheets and the dice roller in a single window. You prepare your scenes ahead of time, send the link, and your players step into the world with nothing to install.
Free basic rules, dice, character creation and a first session: the complete guide to start playing Dungeons & Dragons, around a table or online.
The d20 and the difficulty class, the six ability scores, the rolls, the combat turn, hit points and resting: the basic rules of D&D explained simply.
The twelve D&D classes explained: barbarian, fighter, rogue, cleric, wizard and the rest, their subclasses, and how to pick yours as a beginner.
The monsters of D&D explained: reading a stat block, the creature types, challenge rating, and how to build an encounter that works at your table.
How a session unfolds, what the game master does, dice, character sheets and how to play a tabletop RPG online. A complete guide for beginners.
Game shops, clubs, conventions, Discord, online listings: where to find players for your tabletop RPG and how to write an ad people answer.
Dungeons & Dragons, Call of Cthulhu, Alien, Monster of the Week: six easy tabletop RPGs for a first session, and how to pick the right one.
Concept, class, ability scores, skills, backstory and bonds: the full method to create a tabletop RPG character who will carry a whole campaign.
No, and it is a poor way in. The rules are enough to play from the very first session, and the setting is learned by playing. A player needs to know where their character comes from and what the town the adventure opens in looks like, nothing more. The rest arrives session after session, through what the group runs into.
The Forgotten Realms, because nearly every supplement, published adventure and online resource points back to it. You get a map, detailed cities and scenarios ready to run. Eberron and Ravenloft are excellent, but they ask the game master to explain more before the first session.
The publisher's campaign books first, with a guide devoted to each world. Alongside them, community wikis gather the essentials for free, and the novels published since the eighties tell the major events of the Forgotten Realms and Dragonlance. None of it is compulsory: your version of the world outranks theirs.