# Tut 0x01 - Baby's First Addon

A quick primer on addons for Garry's Mod, and Artery.

You may have seen on the gmod wiki, instructions on running lua code. One way is to place files in your `garrysmod/lua/autorun` directory, and they will be run automatically when you enter single player. This can get messy though, another way to run lua is by making a folder in `garrysmod/addons/<addon_name>/lua/autorun`, and placing your scripts in that (i.e. so that `garrysmod/addons/my_first_addon/lua/autorun/hello.lua` is a valid file). As it turns out, all folders under `garrysmod/addons/<addon_name>` get reflected! This means that if you have a file `garrysmod/addons/data/pac3/my_pac.txt` it will appear in the pac editor and a pac you can load!

This is the method used by addons for Artery. Since Garry's Mod loads addons's autorun BEFORE gamemodes, Artery uses the `data/artery/global/` folder to run scripts after the gamemode as loaded (and therefore has access to the nrequire() function, more on this later).

## Lets get started

Start by creating a new folder under `garrysmod/addons/` called `artery_rougelite`. We'll be using this folder for the rest of the tutorials to build a small rougelike gamemode to explore the different features artery provides.

Now create another folder under the folder you just made `garrysmod/addons/artery_rougelite/data`

Now another `garrysmod/addons/artery_rougelite/data/artery/`

And another `garrysmod/addons/artery_rougelite/data/artery/global/`

With the folder structure set up, we're ready to actually write some lua.

Create a file `garrysmod/addons/artery_routelite/data/artery/global/helloworld.txt`

and copy+paste the following code into it.

```
print("Hello, world!")
```

Now start up garrysmod with the Artery gamemode selected. Head into flatgrass or something. Open your console, you should see "Hello, world!" printed.