This is a really good oversight (see: insight, overview, etc). Honestly, for anyone actually interested in this stuff and what makes the internet tracking/advertising machine tick, take some of the HubSpot Academy’s courses. There’s definitely other courses out there, but the HubSpot ones are all free, and the topics aren’t hard once you get immersed in it.
Plus afterwards you can put the faux-certs on your resume and knife fight with the 20,000,000 other adtech people that just got laid off.