Add explanation

src/renderer/src/stories/pages/guided-mode/GuidedStart.js

@@ -65,16 +65,27 @@ export class GuidedStartPage extends Page {
                         <p>
                             The second section will have you provide your source data files and NWB File metadata on a per-subject basis to populate your files.
                         </p>
+
                         ${new InspectorListItem({
-                            message: html`<b>Red boxes are error messages.</b> These will block your conversion progress
+                            message: html`Red boxes are <b>Error</b> messages. These will block your conversion progress
                                 until resolved.`,
                             type: "error",
                         })}
                         ${new InspectorListItem({
-                            message: html`<b>Yellow boxes are warnings.</b> Fixing them will align your NWB files with
+                            message: html`Yellow boxes are <b>Warning</b> messages. Fixing them will align your NWB files with
                                 best practices.`,
                             type: "warning",
                         })}
+
+                        <p>
+                            Throughout the forms found in the GUIDE, asterisks (<span style="color:red;">*</span>) represent required properties. 
+                            Attempting to move forward will throw an <b>Error</b> until these properties are filled in.
+                        </p>
+                        <p>
+                            Gray asterisks (<span style="color:gray;">*</span>) are sometimes used to represent loose requirements, where missing this property will throw an <b>Error</b>
+                            — though you don't need to specify a value at the current stage.
+                        </p>
+                        
                         <h4>3. Conversion Preview</h4>
                         <p>
                             In the third section, you will preview your conversion before uploading to DANDI.