15) What is DNS and How it works

How to Scale Database https://www.youtube.com/watch?v=Am9LI2Ea6Xo&t=5s&ab_channel=VKSCoding

What is Message Queue | RabbitMQ | Kafka https://www.youtube.com/watch?v=IeLP6UhdT78&t=920s&ab_channel=VKSCoding

What is CDN and How it works : https://www.youtube.com/watch?v=iQfFj93h0JQ&ab_channel=VKSCoding

System Design Basic Playlist : https://www.youtube.com/playlist?list=PLOPyFpEUidvV3xGwgjQfRpzFKq4vsS3AZ