Advice/Guidelines for launching new modern site to replace company intranet?

I understand your concerns about updating your company's intranet, and I'm here to help ensure a smooth transition! Here are some advice and best practices from my experience:

1. Create and Design Your New Site:

• Start by creating a new Communication site and design it according to your specifications.

2. Prepare for Transition:

• Communicate with your users about the upcoming change, providing them with an overview and timeline.
• Consider running a pilot test with a small group of users to gather feedback and make necessary adjustments.

3. Site Swap:

• Once your new site is ready, go to the Site Admin section in SharePoint.
• Perform a site swap to make your new site the default at your tenant URL (companyname.sharepoint.com). The previous site will be moved to a new URL, typically /sites/Archived-xxxxx.
• The site swap feature is designed to handle transitions smoothly, ensuring that your old site's content is archived and accessible if needed.

4. Redirection and Bookmarks:

• Ensure that important data is replicated on the new site to accommodate users' existing bookmarks.

5. Post-Launch Support:

• After the transition, monitor the new site closely for any issues or user feedback. Conduct surveys or use tools like Microsoft Clarity for user insights.
• Provide support and training resources to help users adapt to the new site.

Checkout this link:

https://learn.microsoft.com/en-us/sharepoint/modern-root-site

And if you have any question don't be afraid to ask! Just quote me or post here