SharePoint
A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
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STS#3 template is a site with new experience and no connection to an Office 365 Group.
SST#0 template is a site with a classic experience on the home page and no connection to an Office 365 Group.
In addition to classic pages and modern pages, the modern document lists and library experience in SharePoint is faster, displays better in mobile browsers, and is easier to use than the classic experience.
As a SharePoint in Microsoft 365 site owner, you can view information about how users interact with your site through Site Usage.
What’s more, Power Automate is easier than before to automate processes without extensive developer resources. Power Automate uses a rich, graphical interface that makes it simpler to automate processes, and is designed to work great on mobile devices.
You could also learn more about the difference between modern sites and classic sites by the article:
https://support.microsoft.com/en-us/office/sharepoint-classic-and-modern-experiences-5725c103-505d-4a6e-9350-300d3ec7d73f
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Hi, @Roopak Sahoo
Yes, Microsoft made it clear that the modern experience is the mainstream, and the classic will be deprecated in the future.
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