I want to know the settings of nextdns.

I have a network device, I have a network to try new methods.

So impressed with Nextdns service. I live in Bangkok. I tested several other providers. In my region, I have tested that the nextdns service is the best option and it is stable and has very low latency and is secure and private and customizable.

I would like to know what is the difference.

( Cache Boost ) I wonder if it is useful or not. Should I use it or not?

( CNAME Flattening )  I wonder if it is useful or not. Should I use it or not?

( Handshake ) I wonder if it is useful or not. Should I use it or not?

Thank you for your great knowledge