Improve quickstart page with better structure and troubleshooting

quickstart.mdx

@@ -4,9 +4,19 @@
 keywords: ["quickstart","deploy","get started","first steps"]
 ---
 
+<Info>This guide takes approximately 5 minutes to complete.</Info>
+
 After you complete this guide, you'll have a live documentation site ready to customize and update.
 
-## Before you begin
+## Prerequisites
+
+Before starting, make sure you have:
+
+- A [GitHub account](https://github.com/signup) (GitLab and Bitbucket are also supported)
+- [Node.js](https://nodejs.org/en) v20.17.0 or higher (only required for CLI usage)
+- A code editor like [VS Code](https://code.visualstudio.com/) (only required for local development)
+
+## How Mintlify works
 
 Mintlify uses a docs-as-code approach to manage your documentation. Every page on your site has a corresponding file stored in your documentation <Tooltip tip="Your documentation's source code where all files and their history are stored. The web editor connects to your documentation repository to access and modify content, or you can edit files locally in your preferred IDE.">repository</Tooltip>.
 
@@ -16,7 +26,7 @@
 
 Go to [mintlify.com/start](https://mintlify.com/start) and complete the onboarding process. During onboarding, you'll connect your GitHub account, create or select a repository for your documentation, and install the GitHub App to enable automatic deployments.
 
 After onboarding, your documentation site is deployed and accessible at your `.mintlify.app` URL.
 
 <AccordionGroup>
   <Accordion title="Optional: Skip connecting GitHub during onboarding">
@@ -50,13 +60,17 @@
   Your site is ready to view immediately. Use this URL for testing and sharing with your team. Before sharing with your users, you may want to add a [custom domain](/customize/custom-domain).
 </Tip>
 
+<Check>
+  **Success!** If you see your documentation site with the default Mintlify template, your deployment is working correctly. You're ready to make your first change.
+</Check>
+
 ## Make your first change
 
 <Tabs>
   <Tab title="CLI">
     <Steps>
       <Step title="Install the CLI">
         The CLI requires [Node.js](https://nodejs.org/en) v20.17.0 or higher. Use an LTS version for stability.
 
         <CodeGroup>
 
@@ -133,14 +147,37 @@
   </Tab>
 </Tabs>
 
+## Troubleshooting
+
+<AccordionGroup>
+  <Accordion title="GitHub App installation failed">
+    Make sure you have admin permissions on the repository you're trying to connect. If you're part of an organization, you may need an organization admin to approve the GitHub App installation.
+  </Accordion>
+  <Accordion title="Node.js version error when installing CLI">
+    Mintlify CLI requires Node.js v20.17.0 or higher. Check your version with `node --version` and update if needed. We recommend using [nvm](https://github.com/nvm-sh/nvm) to manage Node.js versions.
+  </Accordion>
+  <Accordion title="Deployment not updating after push">
+    Deployments typically complete within 1-2 minutes. Check the deployment status on your [dashboard](https://dashboard.mintlify.com/). If the deployment shows an error, review the build logs for details.
+  </Accordion>
+  <Accordion title="Local preview not loading">
+    Ensure you're running `mint dev` from the root of your documentation directory (where `docs.json` is located). If the port is in use, try `mint dev --port 3001`.
+  </Accordion>
+</AccordionGroup>
+
 ## Next steps
 
 <Card title="Use the web editor" icon="mouse-pointer-2" horizontal href="/editor/index">
   Edit documentation in your browser and preview how your pages will look when published.
 </Card>
 <Card title="Explore CLI commands" icon="terminal" horizontal href="/installation#additional-commands">
   Find broken links, check accessibility, validate OpenAPI specs, and more.
 </Card>
 <Card title="Add a custom domain" icon="globe" horizontal href="/customize/custom-domain">
   Use your own domain for your documentation site.
+</Card>
+<Card title="Customize your branding" icon="palette" horizontal href="/customize/styling/themes">
+  Update colors, fonts, and logos to match your brand.
+</Card>
+<Card title="Write your first page" icon="file-text" horizontal href="/essentials/markdown">
+  Learn MDX syntax and components to create rich documentation content.
 </Card>