Style guide: boot vs start

wiki/src/contribute/how/documentation/style_guide.mdwn

@@ -14,6 +14,31 @@
 
   - Use hyphens instead of underscores to separate words.
 
+- **boot** vs **start**
+
+  - Use *start* and *restart* as much as possible to refer to starting a
+    computer on Tails; *boot* is almost always unecessary jargon.
+
+  - You might use *boot* when the word is displayed to the user by the
+    computer or when writing for a technical audience, like in our
+    design documentation.
+
+  - Use *boot* when referring to *boot options*, which are only
+    documented for workarounds or a technical audience.
+
+  - *For example*:
+
+    - Most computers do not start on Tails by default.
+
+    - The following instructions explain how to display the boot menu
+      and start on the USB stick.
+
+    - When starting Tails, add the <span class="command">toram</span>
+      boot option in the <span class="application">Boot Loader
+      Menu</span>. For detailed instructions, see the documentation on
+      [[using the <span class="application">Boot Loader
+      Menu</span>|doc/first_steps/startup_options#boot_loader_menu]].
+
 - **bulleted lists**
 
   Refer to this article from NN/g on [presenting bulleted