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Author: Ukendio

docs/learn/overview/first-jecs-project.md

@@ -1,3 +1,71 @@
-## TODO
+# First Jecs project
 
-This is a TODO stub.
+Now that you have installed Jecs, you can create your [World](world.md).
+
+:::code-group
+```luau [luau]
+local jecs = require(path/to/jecs)
+local world = jecs.World.new()
+```
+```typescript [typescript]
+import { World } from "@rbxts/jecs"
+const world = new World()
+```
+:::
+
+Let's create a couple components.
+
+:::code-group
+```luau [luau]
+local jecs = require(path/to/jecs)
+local world = jecs.World.new()
+
+local Position = world:component()
+local Velocity = world:component()
+```
+
+```typescript [typescript]
+import { World } from "@rbxts/jecs"
+const world = new World()
+
+const Position = world.component()
+const Velocity = world.component()
+```
+:::
+
+Systems can be as simple as a query in a function or a more contextualized construct. Let's make a system that moves an entity and decelerates over time.
+
+:::code-group
+```luau [luau]
+local jecs = require(path/to/jecs)
+local world = jecs.World.new()
+
+local Position = world:component()
+local Velocity = world:component()
+
+for id, position, velocity in world:query(Position, Velocity) do
+    world:set(id, Position, position += velocity)
+    world:set(id, Velocity, velocity * 0.9)
+end
+```
+
+```typescript [typescript]
+import { World } from "@rbxts/jecs"
+const world = new World()
+
+const Position = world.component()
+const Velocity = world.component()
+
+for (const [id, position, velocity] of world.query(Position, Velocity)) {
+    world.set(id, Position, position.add(velocity)
+    world.set(id, Velocity, velocity.mul(0.9))
+}
+```
+:::
+
+## Where To Get Help
+
+If you are encounting problems, there are resources for you to get help:
+- [Roblox OSS Discord server](https://discord.gg/h2NV8PqhAD) has a [#jecs](https://discord.com/channels/385151591524597761/1248734074940559511) thread under the [#projects](https://discord.com/channels/385151591524597761/1019724676265676930) channel
+- [Open an issue](https://github.com/ukendio/jecs/issues) if you run into bugs or have feature requests
+- Dive into the nitty gritty in the [thesis paper](https://raw.githubusercontent.com/Ukendio/jecs/main/thesis/drafts/1/paper.pdf)