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+Apart from [trace][], there are only very little builtin operators in `alv` -
+you can see all of them in the *builtins* section of the [reference][:/:].
+All of the 'real' functionality of `alv` is grouped into *modules*, that have
+to be loaded individually. *Modules* help organize all of the operators so that
+it is less overwhelming to look for a concrete feature. It is also possible to
+create your own plugins as new modules, which will be covered in another guide
+soon.
+
+Let's try using the [`+` operator][:math/+:] from the [math/][] module. To use
+operators from a module, we need to tell `alv` to load it first: We can load
+*all* the operators from the [math/][] module into the current scope using the
+[import*][] builtin:
+
+    (import* math)
+    (trace (+ 1 2))
+
+prints
+
+    trace (+ 1 2): <num= 3>
+
+Because it can get a bit confusing when all imported operators are mixed in the
+global scope, it is also possible to load the module into its own scope and use
+it with a prefix. This is what the [import][] builtin is for:
+
+    (import math)
+    (trace (math/+ 1 2))