For me one of the pain points I had as a beginner was setting the DNS records. I couldn't figure out what I was doing and the propagation time was making me anx

For me one of the pain points I had as a beginner was setting the DNS records. I couldn't figure out what I was doing and the propagation time was making me anxious because I never knew if I implemented it right. Also, I think SNS has a limit of 10000 domains, do you know what to do after that?