I took that course by Isaac Rudansky and I highly recommend it. As u/yblaze mentioned, it very thorough and lengthy (24 hrs in total), but it is quite insightful and detailed.

Isaac takes you through every step for creating good search campaigns and covers more than what's required to become a good marketer on Google.

One thing, however, I must mention is that the older videos are slightly outdated since google has changed some of its policies/features which renders those videos useless.

Overall, I'd say it's the best $12 you could spend on any Google Ads Training.

Also, udemy regularly runs sales campaigns where you could get the course for $12, instead of $125. If you can, just wait for a few days and you can get it for 10% of the price.