How to block specific trackers/ads?

[Plus0974]

I'm setting up ad/tracker blocking for the first time using the blocklists in unbound DNS and after doing some adblock tests I keep getting something saying it failed to stop the google domain tracker "https://pagead2.googlesyndication.com" I tried adding it to the block list domain but it still didn't show as successfully blocked. Is there somewhere else I'm supposed to paste it into or something else I'm supposed to do?