ArenaNet has provided a new player guide for Guild Wars 2:

https://www.guildwars2.com/en/new-player-guide

I didn't want to put it on my guide nor to extra resources, as the "guide" is very, very limited. But if you start playing, you may like to take a look at it at the beginning, because it introduces some basic concepts of the playing itself, like skills, marks on map and so on.