refactor(docs): Change behavior to behaviors

Makes a better URL.

docs/docs/behaviors/key-press.md

@@ -0,0 +1,59 @@
+---
+title: Key Press Behaviors
+sidebar_label: Key Press
+---
+
+## Summary
+
+The most basic of behaviors, is the ability to send certain keycode presses and releases in response to activating
+a certain key.
+
+The categories of supported codes are:
+
+- [Keyboard & Keypad](../codes/keyboard-keypad)
+- [Editing](../codes/editing)
+- [Media](../codes/media)
+- [Applications](../codes/applications)
+- [Input Assist](../codes/input-assist)
+- [Power](../codes/power)
+
+Please visit the [codes](../codes) section for a comprehensive list.
+
+For advanced users, user-defined HID codes are also supported but must be encoded, please see [`dt-bindings/zmk/keys.h`](https://github.com/zmkfirmware/zmk/blob/main/app/include/dt-bindings/zmk/keys.h) for further insight.
+
+## Keycode Defines
+
+To make it easier to encode the HID keycode numeric values, most keymaps include
+the [`dt-bindings/zmk/keys.h`](https://github.com/zmkfirmware/zmk/blob/main/app/include/dt-bindings/zmk/keys.h) header
+provided by ZMK near the top:
+
+```
+#include <dt-bindings/zmk/keys.h>
+```
+
+Doing so makes a set of defines such as `A`, `N1`, etc. available for use with these behaviors
+
+:::note
+There is an [open issue](https://github.com/zmkfirmware/zmk/issues/21) to provide a more comprehensive, and
+complete set of defines for the full keypad and consumer usage pages in the future for ZMK.
+:::
+
+### Improperly defined keymap - `dtlib.DTError: <board>.dts.pre.tmp:<line number>`
+
+When compiling firmware from a keymap, it may be common to encounter an error in the form of a`dtlib.DTError: <board>.dts.pre.tmp:<line number>`.
+For instructions to resolve such an error, click [here](../troubleshooting###Improperly-defined-keymap)
+
+## Keypad Key Press
+
+The "keypad key press" behavior sends standard keypad keycodes on press/release.
+
+### Behavior Binding
+
+- Reference: `&kp`
+- Parameter: The keycode usage ID from the keypad usage page, e.g. `4` or `A`
+
+Example:
+
+```
+&kp A
+```