About pop-up ads and windows in Safari - https://support.apple.com/HT203987 - "Learn how to block annoying pop-up ads on your iPhone, iPad, iPod touch, or Mac."
Recognize and avoid phishing messages, phony support calls, and other scams - https://support.apple.com/HT204759
If you are uncertain about a message and a resource provided in that message, do not click on any links. Try to independently verify the resource by going to a support page on apple.com and use that to contact Apple.
Forward email attempts as an attachment (in MacOS Mail use the paperclip icon) to: reportphishing@apple.com then delete it.