September 2017 Update

Task/Variables/DM/variables-1.dm

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+// Both of the following declarations can be seen as a tree,
+// var -> <varname>
+var/x
+var y
+
+// They can also be defined like this.
+// This is once again a tree structure, but this time the "var" only appears once, and the x and y are children.
+var
+    x
+    y
+// And like this, still a tree structure.
+var/x, y

Task/Variables/DM/variables-2.dm

@@ -0,0 +1,12 @@
+// Here, "/obj" is the type, a /obj being a simple game object.
+var/obj/x
+// It can also be defined like this, because of the tree structure:
+var
+    obj
+        x
+// Or this
+var/obj
+   x
+
+// ...
+// You get the idea

Task/Variables/DM/variables-3.dm

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+var/x = 0
+x = 10
+var/y
+y = "hi!"