How can I turn off emails and other notifications?
You can fully customise all your notifications.
You may have to click the unsubscribe button at the bottom of the newsletter email if you want to unsubscribe from that one. Otherwise, all other emails can be opted out of on the page linked above.
Tip: If you scroll to the bottom of the notifications settings there is a button that allows you to unsubscribe from all emails at once.