The first video, Ads Quality Basics, provides a general introduction to Ads Quality, including an overview of Quality Score and answers to some common questions about Ads Quality. If you don't know how Quality Score works, this is a good video to watch.
The second video, Ads Quality Updates, goes beyond the basics and gives more detail on the recent changes made to Ads Quality. If you want to know more about how the change from inactive keywords to first page bids affects your campaigns, we recommend this video.
Source:→ AdWords Blog