A Virus and Malware warning/redirected to a Webpage Page (Screenshot Incl.)

These are all just scams, leave the page or quit Safari. Apple would never contact you in this way, no one can see what's on your Mac. Keep ahead of adware and malware with Malwarebytes, it should be all you ever need. And keep away from untrustworthy websites, that end up giving you pop ups/ webpages telling you your Mac is infected.

I would close Safari, then restart Safari while holding the Shift key:

Safari will start without the scam message, then in

Safari menu->Preferences->Advanced->check the "Show develop menu in menubar".

The menu bar now has the Develop menu point, select it, then choose "Empty Caches".

Next time safari will not display the scam.

This happens to millions of people every day. Ignore. As long as you didn't install anything - and from your description, you didn't - you have nothing to worry about.

Yes, I can confirm this is a just a web page that's trying to trick you into downloading software (mostly likely malware).

Ignore and move on.

:-)

These are ads appearing while browsing , you have not installed any malware in Mac , to avoid it always use reader mode https://support.apple.com/en-gb/guide/safari/sfri32632/12.0/mac/10.14

Add:

when you open Safari while holding the shift key (see above):

also clear all history (of course)