As it goes with almost any MMORPG, World of Warcraft is a very grindy game. In it, you’ll have to pump your character to the maximum available level before you can get to the end-game content which all players are so used to. And the problem is – the process of going through all the expansions just to get yourself one new class to be playable in raids is very time consuming. Even if you have a vanilla WoW leveling guide at your disposal, you still have to do all the boring quests or clear those repetitive dungeons over and over again. This pattern affects almost every activity in this online world. At the end of your day, you need to really dedicate your time to playing the game or you will get nowhere.
Most of the time you spend leveling will involve questing and slaying monsters, but there’s also a lot of travel. Travel earns you little experience (you do gain a bit for discovering new areas), so it’s wise to keep travel to a minimum. The new level scaling system, which scales zones to your level within a preset range, helps with that. You can choose what zones you want to experience and stick with them until you finish their quests.
Fishing requires much time and does not yield much profit until its later levels. Unless you enjoy it for its own sake, avoid seriously delving into fishing until your level limit. It is not a bad idea to do a little when starting out a new character on a new server, though - the gray items you fish up sell for good money to a starter, which can help you out with your other tradeskills.
I've been having what is apparently a scaling issue caused by inflated secondary stats on some Wrath of the Lich King items. In particular, my Highmountain tauren warrior leveled through Northrend and picked up a green, iLvl 87, 2h sword. All of the secondaries were in the +25 to +30 range, and the Dugi Gear Advisor decided it was better than the heirloom 2h axe I was using. So I went ahead and equipped the sword.
Citation de le bute-noobJ'utilise pas d'addon , pas besoin de savoir combien de dégats je fais si je vois mon adversaire mort , je traque les mobs rare avec seulement mon instinct , une bonne carte et une paire de jambes pour courir et laisser les autres faire le sale boulot a ma place (technique très utilisé a mop pour les world boss avec leurs cris qu'ont entend à100km a la ronde) , je fouille mes sacs comme un aventurier en regardant un par un chaque sac , je regarde pas les récompenses des quètes ou des expéditions , je le fait et seul les remerciements me sont suffisants "Une tortue a atteint l'océan !"
Last I wanna share a curious bug that almost freezes my game and force me to disable the addon. Anytime I add a (Citadel Crossbow [of the Fireflash]) my fps go from 75 to 22, and It's on a paladin, paladins dont even use crossbows. I noticed everytime I put something in my bags the addon takes the math and my fps goes from 75 to ~22 for a while (3 to 7 seconds) and is think it's internal and also think it's fine.
Also note that power leveling is sometimes used to refer to paying someone else to level your character to cap as fast as possible (i.e. they power level for you); a distinction used by Blizzard is to refer to the paid leveling as "power leveling service." This behavior is against Blizzard's Terms of Service. Power leveling yourself, which this article covers, is perfectly acceptable.
I think this may have been a case of that specific sword simply having wildly inflated secondaries. If I recall correctly, when I played during Wrath, +STR and +Hit were the stat kings for plate DPS classes (I remember all the guides recommending +STR gems in every slot and +STR enchants on everything) and secondary stats were, well, secondary, and inflated secondaries on a weapon weren't that big a deal. But now that secondary stats have so much more importance, I suspect that an "outlier" weapon like that just wreaks havoc with modern calculations, so that all the addon sees is that this particular sword offers +15 more Haste and Crit than everything else that drops.
Determine the gear stats and armor type you need for your new character. For example, a paladin requires Strength as their main stat, and heavy armor (the armor type) will scale as the character scales if they are initially unable to wear heavy armor due to being a lower level. Your optimal heirloom gear set will feature the same main stat as your starting gear. 

the guides work great for leveling almost in autopilot, also the zygor guides work great, the only problem is that this 2 companies moved to a monthtly fee payment model for BFA, not worth the money that you are paying if you ended up paying almost the same as the game monthtly subscription. Recently there is a new free addon for leveling in curse addons webpage that do this without the payment, is not as advanced like the pay ones but works. i will leave the link below. We need to support this kind of free addons.
Before you can write any sort of code, you'll want to have a tool that lets you edit your AddOn files. However do not get overly distracted with the tools themselves while trying to get your first AddOn created. Any text editor, like Windows Notepad can edit the files. All AddOn files are plain text files. The editors can make the coding and many repetitive tasks easier for day to day editing, but it's often very difficult to learn the tools and try to learn the AddOn at the same time.
Also Alliance currently has a 30% XP buff in War Mode (Horde has 10%) that will last the reset since that bonus changes reset by reset depending on faction participation in War Mode (so next week might be lower, or stay the same, 30% is the cap limit, it will change from 10% to 30% week by week for both factions depending on representation). It works from 20 onwards, it gives you extra abilities you can earn via leveling to use in PvP.