Website went blank when transferring from non www to www

[thegurjyot (Gurjyot Singh)]

I am trying to redirect my domain.com to www.domain.com using the process mentioned here.

Redirect additional domain(s) to your Discourse instance

2024-04-09 This guide is outdated according 2024-04-09 @pfaffman edited this to say that this is no longer necessary, as the current NGINX config in the standard install redirects everything to https://HOSTNAME. You can test this by entering your IP address and see that it gets redirected. If you want multiple domains pointed to your server, you probably want them to have valid https certificates. To do that, follow instructions at Set up Let’s Encrypt with multiple domains / redirects. Origina…

But as I rebuild the app and visited my website, the website did open with www but the website is a complete blank. A clean white tab is opening with nothing on it. I checked the developer console and found a lot of warnings and content security policy notices.
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Can someone tell what the issue is? A good member of this community also suggested me to directly host the website on www.domain.com instead of domain.com but that opened some new issues with email@www.domain.com which I do not want. So how to redirect domain.com to www.domain.com? After this, I’ll head towards Let’s Encrypt SSL and how to manage redirections after that?

[codinghorror (Jeff Atwood)]

You need a DNS registrar that can do a DNS redirect from the apex domain example.com to a subdomain www.example.com

It has different names, FWD record, “web forward” etc but it is best handled by your DNS provider.

Root domain redirect to www

[thegurjyot (Gurjyot Singh)]

So the process linked above is of no use to me and I should revert it or keep it? And lastly, after this setup, should I follow Discourse’s Let’s Encrypt tutorial or Cloudflare SSL?
Sorry to ask so many questions but I am doing all of this first time and I am quite overwhelmed with all this new information.