Compress Transfer & Cache static content Optimization

Can someone explain to me how I can improve the two red points of level F?
What do I have to do or optimize?

And what about Effective use of CDN? I can activate this point in the WordPress Plugin WP Super Cache, does this make sense in my case?

The website in question:

Hi - your website doesn’t even seem to be accessible currently? It pings back and port 80/443 are open but the browsers / webpage test just times out.

Regarding compress transfer - that normally means you don’t have Gzip compression enabled. Just google for it - there are a ton of tutorials for Apache and Nginx depending on your run time.