diff --git a/docs/guide/actions.md b/docs/guide/actions.md
index 517751450..b3fb64078 100644
--- a/docs/guide/actions.md
+++ b/docs/guide/actions.md
@@ -8,11 +8,11 @@ Action methods are methods on your app or widgets prefixed with `action_`. Aside
 
 !!! information
 
-    Action methods may be coroutines (methods with the `async` keyword).
+    Action methods may be coroutines (defined with the `async` keyword).
 
 Let's write an app with a simple action.
 
-```python title="actions01.py" hl_lines="6-8"
+```python title="actions01.py" hl_lines="6-8 12"
 --8<-- "docs/examples/guide/actions/actions01.py"
 ```
 
@@ -36,7 +36,7 @@ Action strings have a simple syntax, which for the most part replicates Python's
 
 !!! important
 
-    As much as they look like Python code, Textual does **not** call Python's `eval` function or similar to compile action strings.
+    As much as they *look* like Python code, Textual does **not** call Python's `eval` function or similar to compile action strings.
 
 Action strings have the following format:
 
@@ -75,7 +75,7 @@ When you click any of the links, Textual runs the `"set_background"` action to c
 
 ## Bindings
 
-Textual will also run actions that are bound to keys. The following example adds key [bindings](./input.md#bindings) for the ++r++, ++g++, and ++b++ keys which call the `"set_background"` action.
+Textual will also run actions bound to keys. The following example adds key [bindings](./input.md#bindings) for the ++r++, ++g++, and ++b++ keys which call the `"set_background"` action.
 
 === "actions04.py"
 
@@ -102,7 +102,7 @@ The following example defines a custom widget with its own `set_background` acti
     --8<-- "docs/examples/guide/actions/actions05.py"
     ```
 
-=== "actions05.py"
+=== "actions05.sass"
 
     ```sass title="actions05.css" 
     --8<-- "docs/examples/guide/actions/actions05.css"
@@ -158,6 +158,3 @@ Textual supports the following builtin actions which are defined on the app.
 ### Quit
 
 ::: textual.app.App.action_quit
-
-
-*TODO:* document more actions
diff --git a/docs/guide/reactivity.md b/docs/guide/reactivity.md
index 73edf48cb..5b4cf2af7 100644
--- a/docs/guide/reactivity.md
+++ b/docs/guide/reactivity.md
@@ -111,7 +111,7 @@ class MyWidget(Widget):
 
 ### Layout
 
-The smart refresh feature will update the content area of a widget, but will not change its size. If modifying an attribute should change the size of the widget, you should set `layout=True` on the reactive attribute. This ensures that your CSS layout will update accordingly.
+The smart refresh feature will update the content area of a widget, but will not change its size. If modifying an attribute should change the size of the widget, you can set `layout=True` on the reactive attribute. This ensures that your CSS layout will update accordingly.
 
 The following example modifies "refresh01.py" so that the greeting has an automatic width.
 
@@ -138,9 +138,11 @@ If you type in to the input now, the greeting will expand to fit the content. If
 
 ## Validation
 
-The next superpower we will look at is _validation_. If you add a method that begins with `validate_` followed by the name of your attribute, it will be called when you assign a value to that attribute. This method should accept the incoming value as a positional argument, and return the value to set (which may be the same or a different value).
+The next superpower we will look at is _validation_, which can check and potentially modify a value you assign to a reactive attribute.
 
-A common use for this is to restrict numbers to a given range. The following example keeps a count. There is a button to increase the count, and a button to decrease it. 
+If you add a method that begins with `validate_` followed by the name of your attribute, it will be called when you assign a value to that attribute. This method should accept the incoming value as a positional argument, and return the value to set (which may be the same or a different value).
+
+A common use for this is to restrict numbers to a given range. The following example keeps a count. There is a button to increase the count, and a button to decrease it. The validation ensures that the count will never go above 10 or below zero.
 
 === "validate01.py"
 
@@ -159,7 +161,7 @@ A common use for this is to restrict numbers to a given range. The following exa
     ```{.textual path="docs/examples/guide/reactivity/validate01.py"}
     ```
 
-If you click the buttons in the above example it will show the current count. When `self.count` is modified in the button handler, Textual runs `validate_count` which limits self.count` to a maximum of 10, and stops it going below zero.
+If you click the buttons in the above example it will show the current count. When `self.count` is modified in the button handler, Textual runs `validate_count` which performs the validation to limit the value of count.
 
 ## Watch methods
 
@@ -218,8 +220,10 @@ The following example uses a computed attribute. It displays three inputs for th
     ```{.textual path="docs/examples/guide/reactivity/computed01.py"}
     ```
 
-Note the `compute_color` method which combines the color components into a [Color][textual.color.Color] object. When the _result_ of this method changes, Textual calls `watch_color` which uses the new color as a background.
+Note the `compute_color` method which combines the color components into a [Color][textual.color.Color] object. It will be recalculated when any of the `red` , `green`, or `blue` attributes are modified.
+
+When the result of `compute_color` changes, Textual will also call `watch_color` since `color` still has the [watch method](#watch-methods) superpower.
 
 !!! note
 
-    You should avoid doing anything slow or cpu-intensive in a compute method. Textual calls compute methods on an object when _any_ reactive attribute changes, so it can known when it changes.
+    It is best to avoid doing anything slow or cpu-intensive in a compute method. Textual calls compute methods on an object when _any_ reactive attribute changes.
diff --git a/src/textual/app.py b/src/textual/app.py
index 5a1f7c1d0..9dcb85839 100644
--- a/src/textual/app.py
+++ b/src/textual/app.py
@@ -1552,12 +1552,23 @@ class App(Generic[ReturnType], DOMNode):
                 self.set_focus(node)
 
     async def action_switch_screen(self, screen: str) -> None:
+        """Switches to another screen.
+
+        Args:
+            screen (str): Name of the screen.
+        """
         self.switch_screen(screen)
 
     async def action_push_screen(self, screen: str) -> None:
+        """Pushes a screen on to the screen stack and makes it active.
+
+        Args:
+            screen (str): Name of the screen.
+        """
         self.push_screen(screen)
 
     async def action_pop_screen(self) -> None:
+        """Removes the topmost screen and makes the new topmost screen active."""
         self.pop_screen()
 
     async def action_back(self) -> None:
diff --git a/src/textual/widget.py b/src/textual/widget.py
index 9b88fc745..70a3e4282 100644
--- a/src/textual/widget.py
+++ b/src/textual/widget.py
@@ -147,7 +147,7 @@ class Widget(DOMNode):
     """Widget may receive focus."""
     can_focus_children: bool = True
     """Widget's children may receive focus."""
-    expand = Reactive(True)
+    expand = Reactive(False)
     """Rich renderable may expand."""
     shrink = Reactive(True)
     """Rich renderable may shrink."""
diff --git a/src/textual/widgets/_input.py b/src/textual/widgets/_input.py
index 8f3a4a4dc..616844bf2 100644
--- a/src/textual/widgets/_input.py
+++ b/src/textual/widgets/_input.py
@@ -79,13 +79,13 @@ class Input(Widget, can_focus=True):
     """
 
     BINDINGS = [
-        Binding("left", "cursor_left", "cursor left"),
-        Binding("right", "cursor_right", "cursor right"),
-        Binding("backspace", "delete_left", "delete left"),
-        Binding("home", "home", "home"),
-        Binding("end", "end", "end"),
-        Binding("ctrl+d", "delete_right", "delete right"),
-        Binding("enter", "submit", "Submit"),
+        Binding("left", "cursor_left", "cursor left", show=False),
+        Binding("right", "cursor_right", "cursor right", show=False),
+        Binding("backspace", "delete_left", "delete left", show=False),
+        Binding("home", "home", "home", show=False),
+        Binding("end", "end", "end", show=False),
+        Binding("ctrl+d", "delete_right", "delete right", show=False),
+        Binding("enter", "submit", "Submit", show=False),
     ]
 
     COMPONENT_CLASSES = {"input--cursor", "input--placeholder"}
@@ -237,14 +237,14 @@ class Input(Widget, can_focus=True):
 
         # Do key bindings first
         if await self.handle_key(event):
+            event.prevent_default()
             event.stop()
-        elif event.key in ("tab", "shift+tab"):
             return
         elif event.is_printable:
             event.stop()
             assert event.char is not None
             self.insert_text_at_cursor(event.char)
-        event.prevent_default()
+            event.prevent_default()
 
     def on_paste(self, event: events.Paste) -> None:
         line = event.text.splitlines()[0]
@@ -267,6 +267,11 @@ class Input(Widget, can_focus=True):
             self.cursor_position = len(self.value)
 
     def insert_text_at_cursor(self, text: str) -> None:
+        """Insert new text at the cursor, move the cursor to the end of the new text.
+
+        Args:
+            text (str): new text to insert.
+        """
         if self.cursor_position > len(self.value):
             self.value += text
             self.cursor_position = len(self.value)