Neither of these tutorials are specifically for a Pong or Breakout clone, but they're the ones that have worked out the best for me in the past.
Shaun Spalding has a ton of videos on GMS 1 and GMS 2. I recommend the complete platformer tutorial.
https://www.youtube.com/user/999Greyfox/videos
Nathan Ranney did a great basic tutorial for GMS 2. This is by far my favorite starting point.
https://developer.amazon.com/blogs/appstore/post/d5832ec5-fd9b-4bcb-bcc1-27decfb...
Feel free to link other useful tutorials and I'll check em out and maybe add them to the list!