To Find out Details of a website the below are some important links that may help you.
1. https://wappalyzer.com/ : Wappalyzer – Identify technologies on websites

2. https://builtwith.com/ : Find out what websites are Built With

3. https://w3techs.com : Web technologies used by a site – Site Info

4. https://geekflare.com/what-technology-website-using/ : Find Out What technology Website is using

5. https://toolbar.netcraft.com/site_report : Get a Site Report

6. https://www.similartech.com/ : Generate Sales Leads with Web Technology Stack Lookup | SimilarTech

7. https://rescan.io/?redirect_allora=1 : Identify the technologies behind any website

8. https://whatcms.org/ : Detect which CMS a site is using – What CMS?

9. https://whois.net/ : Whois Lookup & IP | Whois.net

10.https://www.whatsmydns.net/ : Find out DNS using whats my dns