Update: The reason for less experience from gathering is due to how Blizzard revamped professions and broke them down by expansion. In order to get full exp from gathering you'll simply need to find a profession trainer for the relevant expansion. (WoD you just mine or herb the first one ypu come across and the game gives you a scroll for learning WoD gathering).
Most classes in World of Warcraft start at first level, but Death Knights and Demon Hunters are exceptions. They start at level 55 and 98, respectively. This alone can shave a huge chunk of time from your leveling experience. Of course, it only works if you want to play a Death Knight or Demon Hunter, but they’re both solid classics that can dish out damage or tank in a group.

Fully rested experience (this is the blue color your experience bar takes instead of purple) grants 200% more experience per kill. Quest experience does not work the same as mob experience. Instead of just using the rested bonus, quest experience pushes the bar further upwards extending the rested bonus. Say if half your experience bar is blue. If you turn in 10 quests all at one the normal experience from them all could boost a character a full level. Unlike mobs where the experience gain will use up said bonus - the quests merely 'push' the bar further. Doing this could net you a level and still have the 200% bonus for mob kills applying to milk the rest bonus.
The publisher already commented on the game’s leveling speed following the launch of the Battle for Azeroth 8.0 pre-patch earlier this month. “Since the pre-patch we’ve made a large number of hotfixes and changes to leveling content, and are continuing to find and fix bugs wherever possible”, Blizzard wrote. “The intention was never to make leveling slower than it was in 7.3.5.”
 ":"  -  Any time a step ends in a ":" instead of a "." means that the next step is part of the current step you are on.  This generally means the next step should be done while working on the current step.  This means every "start working on" or "continue working on" will end in a ":".  But this is used with other occasions as well, so keep this in mind.

Anyway both got to 110 at around 50h played. I messed up with my Pal by going to Legion once I hit 100 instead of finishing treasures and bonuses in WoD. All in all, if I picked the best zones and was only trying to level as fast as I could, I would probably could have done it in roughly 40h. Note that it would have a been A LOT faster with a Monk as both Ret and Rogues don't really have a decent AoE until 40+ (45 for Ret and 63 for Rogue I believe). The daily also helps a lot. I know that leveling my Monk before the pre-patch was insanely fast. Might be slower with the changes to FoF, however.

Gold sellers would steal players’ account information using keylogging malware and phishing scams, so they could strip characters and harvest everything of value. They used stolen accounts and the accounts of players who had paid for “power leveling” services to “bot” for resources, using automated cheat programs to harvest resources that they could quickly liquidate on the in-game auction house. This caused the price for traded goods to crash, which impacted the entire economy.


Anyway, however you choose to get to the addon's menu, choose guide list and then pick the zone you want to quest in. There are some zones that will autoselect based on quests in your log, but not all guides or all quests are set up that way. (If you don't want to switch to a guide that auto-pops up choose "not now" or "never") As you can see in the screenshot, there are various categories of guides. Most max level content (such as Argus) is found in Achievements rather than leveling.
There are various upsides to this imbalance. Max level players are able to complete lower level content with ease, allowing them to swiftly complete missed quests and achievements in earlier zones, and can travel through zones without being constantly attacked, since mobs will only attack players several levels higher than them if walked directly into. Max level also makes it possible to solo earlier group content such as dungeons and even raids, making farming loot such as mounts far easier, and for those interested in a challenge opening up a new subtype of play at slightly higher levels.
Aegwynn - Alliance Aegwynn - Horde Aerie Peak - Alliance Aerie Peak - Horde Agamaggan - Alliance Agamaggan - Horde Aggramar - Alliance Aggramar - Horde Ahn'Qiraj - Alliance Ahn'Qiraj - Horde Al'Akir - Alliance Al'Akir - Horde Alexstrasza - Alliance Alexstrasza - Horde Alleria - Alliance Alleria - Horde Alonsus - Alliance Alonsus - Horde Aman'Thul - Alliance Aman'Thul - Horde Ambossar - Alliance Ambossar - Horde Anachronos - Alliance Anachronos - Horde Anetheron - Alliance Anetheron - Horde Antonidas - Alliance Antonidas - Horde Anub'arak - Alliance Anub'arak - Horde Arak arahm - Alliance Arak arahm - Horde Arathi - Alliance Arathi - Horde Arathor - Alliance Arathor - Horde Archimonde - Alliance Archimonde - Horde Argent Dawn - Alliance Argent Dawn - Horde Arthas - Alliance Arthas - Horde Arygos - Alliance Arygos - Horde Aszune - Alliance Aszune - Horde Auchindoun - Alliance Auchindoun - Horde Azjol Nerub - Alliance Azjol Nerub - Horde Azshara - Alliance Azshara - Horde Aggra (Português) - Alli... Aggra (Português) - Horde Azuregos - Alliance Azuregos - Horde Area 52 - Alliance Area 52 - Horde Azuremyst - Alliance Azuremyst - Horde Ashenvale - Alliance Ashenvale - Horde
Congratulations on reaching Level 120! There are a myriad of new things to do. The first thing you should do is head to your faction hub ship where you have been doing your mission table quests and footholds to pick up and complete the quests necessary to unlock World Quests. World Quests will provide you an opportunity to grind reputation levels, acquire gear, and gather Azerite. There are tons of new things to do that we will cover in our Level 120 Battle Guide found here: Level 120 Battle Guide
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