What are some cool offerings HTTP2 has to offer and what are the challenges?
Is a good explanation of why and what it is.
https://www.cloudflare.com/http2/what-is-http2/
Goes more into performance.
The best features are probably the Multiplexing and Stream Priority.
Cliff Rowley
Thinker, Tinkererer, Dork.
The section "What are the key differences to HTTP/1.x" in this link @mgiambanco posted will tell you everything you need to know to answer your question :-)