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.
Allied races aren’t much better. You can only earn them by grinding out reputation. It doesn’t take that long but casual players will need to invest a couple weeks primarily to it, and focusing on that grind will take you away from others, like earning gear. Each race has its own grind, but the things you do to work through it remain the same, adding to your boredom.
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Other than that, it would be even better if we could get craftable gear up to raid level by obtaining rare materials found in raids/raid bosses (So if for example you raid on heroic, then you can upgrade your crafted gear with these rare raid materials to heroic level). I really liked going through raids not only for loot, but for rare crafting materials back in TBC so I could craft Stormherald/Lionheart as it gave crafting some solid meaning other than being there for the sake of having pre-raid / alt gear that is replaced easily.
Honestly TL:DR of any guide. Is learn your markets, it's as simple as that. Learn who's in it, learn what's profitable, watch different time tables. I've earned 2 million profit OFF 1 market and half set up TSM. I've barely tried before this I was a hardcore raider, only made gold over the years through BOE farming and run sales (which are goood, don't get me wrong) but I want to be making the multiple gold capped characters.
Unless Blizzard has some real story shake-ups and a phenomenally tuned raid on the horizon, I’m honestly expecting the sharpest player decrease to set in within the next few months. The expansion itself has some interesting ideas, but sticking to a World Quest grindfest is quickly becoming the norm, and the Island Expeditions aren’t exactly exciting.
Otherwise, its a pretty lackluster expansion profession-wise as there are no useful sellable gear besides Inscription trinkets. Legion had good and variety stat gear across all professions (JC could make BiS socket-rings, now JC is the worst proff ever, so sad). I hope they change stuff soon but I'm not optimistic about it. You should probably level Pandaria Engineering and Alchemy as much as you can on your characters and invest in Ghost Iron Bar/Trillium Bar transmutes to either sell Living Steel or hold them to craft Sky Golem (30-40k profit each char per month). It's hard to maintain a steady flow of GIB/TB though. I "only" have 6 engineers and my stock drys up pretty quickly.