Each battle that you win will yield experience for each pet that participated. However, deceased companions will not receive any experience (so make an effort to keep them alive by swaping in a different pet). Experience gains are based on your pet's level compared to the wild pet. Defeating a higher level opponent will grant more experience than a much lower level one, but be ready for a tough fight!
The goblins of the Steamweedle cartel have set up several neutral auction houses about Azeroth. Gadgetzan, Booty Bay, and Everlook all house neutral auction houses. The neutral is useful for making money, as commodities that Alliance players can get easily can be sold at a cheap price to Horde players (or vice versa), and then sold at a higher price at a major city.
The most important step in being able to buy a mount and make other large purchases should be self-evident: saving. Economize as often as you can, and don't buy anything unless you absolutely have to. You can burn through hundreds of gold even before level 20 by visiting the auction house for new equipment at every opportunity. If you do so, over the long haul you will be left with very little to show for it. Before level 20, keep your eyes on the prize: getting that mount. The mount helps you move faster. Faster movement means faster killing, faster questing, faster quest turn-ins, and faster leveling. It is the most important tool to fast leveling you can get at level 20, and infinitely more important than getting your hands on that Left-Handed Vorpal Cleaver of the Zipswitch that you could have purchased at level 23. Stay focused.
The Heart of Azeroth is an artifact given to the player character from the world soul via Magni Bronzebeard. It is a necklace that can use the power of Azerite, the lifeblood of the embryonic titan Azeroth (See Plot, below). Azerite is similar in function to Legion's artifact power, in that it is gathered normally from playing the game and is used to upgrade an artifact; likewise, the Heart is similar in function to Legion's artifact weapons by having the capacity to be constantly upgraded. Unlike artifact weapons, however, the Heart is shared with all of the player's specializations and can empower all eligible pieces worn simultaneously.
Item Level Cap Staying at 425 for Crucible of Storms The new raid, Crucible of Storms, is coming in a few weeks, on April 16th, and is bringing higher base item level drops than the Battle of Dazar'alor raid. This made it seem that the maximum possible attainable item level was also increasing, since the Mythic level drops from the Crucible are already at or very close to the 425 cap, before any war or titan forging happens and they had a "+" in the dungeon journal, indicating they could be upgraded. World of Warcraft WoW Mar 26, 2019 at 22:25 by Starym
Razorfen Kraul is maybe the best zone to fill up your auction house with good transmog. It has a big selection of zone wide rare BoE drops, great green drops and an guaranteed chance for a rare BoE from the Enormous Bullfrog. The frog drop a selection of around 30 rare BoEs, most worth around 1-3k. After killing him, there is only one group after that you should kill and then you can leave the instance.
As others have said, there are free alternatives... which is important to consider if the price of the Zygor Guides are a concern. If speed and convenience are more important, then they're worth it. Zygor will take you through the quests in the most efficient way possible, and their customer support and the speed with which they update the guides when changes are made to the game is impressive. I know I went from 80-85 a heck of a lot faster (in /played time) than my co-worker who doesn't have the guides. And we had a bet going to see who would make it first. For me, it was worth it. Your mileage may vary...
Uldir: The first of Battle for Azeroth's raids is an abandoned Titan laboratory, where the cosmos' most powerful beings experimented on ways to eliminate Azeroth's corruptive Old Gods. After the Titans were defeated by Sargeras, the facility remained abandoned, but the festering horrors within endured, growing ever stronger. It is deep within Uldir that players will encounter G'huun, a manufactured abomination the Titans had inadvertently created during their experiments on the Old God's endless corruption.
Using the Looking for Group interface, or joining a good guild, and doing instances that are around your level. You'll learn valuable grouping skills, and the level of loot in an instance is typically much better than what you could find on your own. If possible, concentrate on instances with humanoid mobs, since selling the cloth that they drop is a good way to make money.
Azeroth paid a terrible price to end the apocalyptic march of the Legion’s crusade—but even as the world’s wounds are tended, it is the shattered trust between the Alliance and Horde that may prove hardest to mend. As this age-old conflict reignites, join your allies and champion your faction’s cause—Azeroth’s future will be forged in the fires of war.
Void elf (7.3.5) - "Many have sought to harness the corruptive magic of the Void. Most who tried have fallen into madness. Determined to use this power for the good of Azeroth, Alleria Windrunner is the first mortal to succeed at defying the shadow's whispers. Coming to the aid of a group of her kin who nearly gave in to the darkness, Alleria has vowed to train these Void Elves to control the shadows within them and pledge their newfound powers to the Alliance."