Question regarding "third party cookies"
If you visit "linustechtips.com" and that site gives you a cookie, that is a first-party cookie. If there's an ad on the site and that ad attempts to set a cookie for the domain "eviladvertiser.com", that is a third-party cookie (because it does not belong to the domain you are visiting)
Signing in with Google doesn't mean there are third-party cookies involved. When you click on sign in, you are redirected to Google's site to sign in. Any cookies you receive from Google are now first-party. Once you've signed in, you'll be redirected to the original site with some information to let the site know you've successfully authenticated with Google. The site will accept you as signed in and set its own cookies (which are first-party, since you've been sent back to them).
If you go to another site, click on Sign in with Google, that site will, once again, redirect you to Google. Google can now read its own cookies. Based on these cookies, Google knows you're already signed in. As such Google may immediately redirect you back to the originating site, telling them "QQ_cazo is authenticated with us". The originating site will say "Great, we'll accept QQ_cazo as authenticated". The site may once again set its own session cookies.

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