How to level up fast (WoW)

So how do you level up fast in WoW? Here are my tips, I have a lot of high level characters and also several level 80 characters, so this is all from my experience.

1. Find quest hubs. Quest hubs are places with tons of quests in one place. Something like seven or eight or even more than ten is what you're looking for. Examples: Darkshire, Razor Hill, Southshore etc.
2. Pick up all the quests available in your selected quest hub.
3. Avoid doing quests that are isolated and for which you have to walk a lot to reach their location and once you get there there's only that one quest to do and nothing more.
4. Use Quest Helper addon or use built-in quest tracking - this will help you if you want to know how to level up fast.
5. Inspect your map and visualize routes which you should undertake to cover doing all your quests in one loop.
6. Don't do quests that are much lower level than you are if you're in for fast levelling.
7. Also probably don't do quests which are too hard for your level because you'll spend tons of time doing them.
8. Don't be sorry to sell items fast to a vendor or on the auction house, if you think you can do it quickly. I suggest the Auctinator addon.
9. Buy the best gear you can regularly to speed up yourself in doing quests and in fast levelling.
10. Occasionally do instances - they give nice experience and can be a nice break from quests.
11. Try to do instances for which you have as many quests ready as possible - another thing to help you in how to level fast question.
12. Always log out in in or in a city - very simple, but many people forget it. You get double experience if you're rested. If you don't plan to play your character for a while or don't plan to play WoW for a while, be sure to get all your characters in an inn or in a city to benefit from maximum rested experience once you get back.
13. Use heartstone and other teleport abilities cleverly. If you're questing in an area it might be best to set your heartstone to the quest hub location which will allow you to go quickly back to turn in your quests.
14. Buy the fastest mounts as soon as your level allows it - 60% mounts are available at level 20 and 100% mounts at level 40.

Ok, hope this was helpful, remember that these are the tips for how to level up fast only, if you want you can always stop to smell the roses, enjoy the game, enjoy professions or whatever you want. If you want to see how to level fast - try some of these tips.
I always say this - the main thing is that you enjoy your game. So, enjoy it!