According to a recent report, the developers dug into the numbers and saw that this was a legitimate issue, as leveling in that range took about 15 percent longer than levels before or after. While the hotfix notes don't go into too many details, Blizzard explains that the experience required to gain a level has been lowered for the range of levels 40 to 100. That brings the amount of time needed to level between the magic 60 to 80 range down by 14 percent, with a smaller reduction in time between levels 40 and 49. We figure a lot of math had to go into figuring out a proper adjustment here but, assuming Blizzard's estimates are correct, that should appease players who felt like they were stuck within a certain range for too long.
Getting reputation for the new factions is going to be beneficial in different ways. Earning reputation towards the factions is going to help you unlock Pathfinder in Kul'Tiras and Zandalari. Pathfinder is nothing new so i decided to include it in here. Pathfinder will give your character increased mount speed and its account wide. Also gaining reputation will allow your character to buy gear, from a vendor, equal to Heroic dungeon quality.

 ":"  -  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.

The older brother of this potion originally came about in Cataclysm as the Potion of Treasure Finding, and is actually one of the best ways to make money. Since most Pandaria mats are constantly farmed, they usually sell for less than the Cataclysm mats. This makes using this form of the potion more effective for making gold. Not to mention that creatures die faster to level 90s since they were made for the previous expansion, making farming the treasure chests that drop rather easy.
Guild Banners. The Banner of Cooperation and Battle Standard of Coordination will increase the experience from kills. They both have a 10 minute cooldown, but when you use one, the other is only locked out for 2 minutes. I was very bad about using these, so it might be worth using a macro to drop them on your first attack against an enemy. Keep in mind you must have reputation with your guild before being able to buy these, so new character may have a bit of a wait before picking them up.

Professions have changed dramatically in Legion. While before you simply had to pay for recipes when you were in town, now the trainers as you to gather certain materials or defeat certain targets in order to unlock additional recipes. How can you profit from this new system? Well, to compensate players with the harder recipe unlocks, the developers have implemented a recipe rank system.
Dungeons still give too much experience. Yes, I'll get some hate mail for this. But due to the way dungeons -- especially at some levels -- scale, along with experience buffs, the fastest way from 1-110 now involves grinding one dungeon over and over and over again. It's the equivalent of the South Park "Make Love, Not Warcraft" episode, only instead of killing boars, you're killing endless worms in Ragefire Chasm or gnolls in The Stockades.
Leveling from 58-80: Outland and Northrend Recommended leveling paths for level 60-80 players in WoW. Includes best zones in Outland and Northrend, as well as notable quests and rewards. Leveling from 80-90: Cataclysm and Mists of Pandaria Recommended leveling paths for level 80-90 players in WoW. Includes best zones in Cataclysm and Mists of Pandaria, as well as notable quests and rewards. Leveling from 100-110 in Legion How to level quickly in World of Warcraft Legion from 100 to 110. Includes heirlooms, assaults, useful items, and experience boosts. The Big Bag Guide This guide covers bags from drops, quests rewards, vendors, and professions. Additionally it also covers item type specific containers.