Is http/2 running by default or do I need to do any setup?
I have ee 3.7.5 and nginx 1.14.0
I went to a testing site and it said http/2 running. All my installation is default though. Do I need any wp plugin?
HTTP/2 is default for EE sites, although you have SSL enabled.
I use cloudflare SSL, does that matter or is it better to switch to letsencypt?
In terms of SSL? It doesn’t matter.
I meant in combination with ee. But I presume it also doesn’t matter.