Wether you are a new player, not sure if you want to play this game in the first place, or returning player but are afraid of the levelling grind in previous patches... Fear not!
Levelling 1 - 80 can be done in a day or 2 by simply doing the dark blue quests and yellow (campaign) quests.
These will give all the exp required to level and they will give you enough gear to survive and pass each area.
Just press M to open the map and take the flight (it teleports you there if you press on the little wing icon) to the camp with dark blue quest icons.
1 - 10: Only do the yellow quests (skip all the dark blue quests on the map and in Haramel)
10 - 80: Do all the yellow and dark blue quests.
*You can do daily luna's when you run out of dark blue quests (this happens around level 65 for some people, it depends if you've done luna before or not.)