The Horde will now control most of Kalimdor, and the Alliance most of the Eastern Kingdoms. For a low-level character the quests and storylines won't change, but for high-level players many zones will see changes via phasing. Teldrassil is burned and Undercity is in ruins as the story progresses by phasing. At max level Arathi Highlands and Darkshore are phased to be updated to reflect their status as locations for Warfronts.
Also, all of this mobs in this area are humanoid. This means additional cloth drops for gold. So, you want to do this farm with a character which has Tailoring. Because if you have Tailoring, more clothes will drop thanks to Cloth Scavenging. This is real good because materials are going for good prices in this days. Another advantage of having Tailoring is Resilient Spellthread. It prevents you from being dazed in Kul Tiras and Zandalar.
It's hard to step out of the shadow of Legion, which was utterly fantastic in almost every way, to enter an expansion where you get one item per boss in the last expansion because the rules have been changed to force more grinding, where you have to grind reputation in the old expansion that you probably skipped because rep grinds suck JUST to unlock allied races (who aren't fully unique races since they recycle old content such as animations), where questing has SOMEHOW become boring again and where your new abilities are given by items you'll swap out every level, meanwhile being only boring passive effects no one cares about.
Short term raw material flipping. I think there is a thread up here about it atm actually. If you are buying to hold for more than a week you're opening yourself up to a lot of risk. Buy in the morning and sell at night, and/or buy on the weekend to sell during the week if you have a decent raid population on your server. Start with something you understand, sell from that market and then expand.

One of the most profitable ways to farm in patch 5.4 is to buy Potions of Luck from the auction house and head to the Vale of Eternal Blossoms. In the northwestern corner, specifically the Ruins of Guo-Lai and the Guo-Lai Hills, there's tons of mobs that can be aggroed in huge groups and AOE'd down. The Potion of Luck will increase your chances of finding loot on the monsters, and these mobs in particular drop good crafting mats, Skycrystals, motes of harmony, and Gou-Lai keys. Many guides tout this as the greatest way to farm gold; depending on your ilvl and clear time, you can earn anywhere from 2.5-7.5k an hour.
If you're a new player and buying gold (for some startup money) isn't an option, there's nothing wrong with gathering (especially if you're getting'll be good gold initially if you farm BfA mats and sell high). You can make pretty good money just flipping stuff...and because Legion items are super risky now, it's a good time to get spirits of harmony (just buy what you can and sell it in in bigger stacks at higher costs or turn it into ore/bars or lotus to sell when that is profitable). I'd avoid putting all of your gold there though. Sometimes a bot or just someone returning to the game will dump 10+ stacks of 200 spirits cheap and tanks the markets for a bit. Flipping (if you get good at it) will make you more gold in than long run than farming but if you don't have much gold either is a step forward from here. They key to making gold is having the flexibility to lock up most of your gold in items and wait patiently to sell them at a good price but you gotta start small (or cheat like me...when I came back in December I just spent $100 on tokens and haven't spent money on anything other than the Collector's edition since. It's a lot easier to make gold if you already have some.
Professions are skills used to create and enhance items (gears). You will start with one skill once your character has learned a profession. When you use the profession, your skill will increase. A profession’s higher skill will allow you to create more powerful items. If you change a primary profession, you will lose any skill you have made with your original profession. So it is important to choose your primary professions wisely.
Level 120 comes and goes. Island Expeditions have unlocked, but it turns out they’re not much fun, and the most rewarding versions are only accessible to premade groups. You turn to Warfronts only to realize they’re not available this week. Fine. You can always grind out better gear. Except as you do, you notice your new gear has higher Azerite requirements than your old gear, which means your shiny new items have fewer unlocked traits than what they replaced. Discouraged, you decide to roll as one of the cool new Allied Races. Except you can’t because they’re all locked behind reputation grinds.
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I'll typically buy cards that are < 66% of my crafting cost in unlimited quantities. If I have high stocks, i'll try to repost at 1/8 of the deck's market rate. I don't care if someone is resetting the market because i WANT sales volume and if someone is trying to a reset it's usually low enough for them to buy you out. The point here is to constantly churn your inventory and adjust down with the market.
Well, if you have been playing the World of Warcraft since it was released, you may noticed a site, which was existed only two years after the WOW released and now it has been selling WOW Gold for over 10 years, you can totally believe that we can provide you guys cheap WOW Gold with a reasonable price and a professional buying experience. 
I only play 2 characters and normally have all my Mythic 0s done by Wednesday. After that I come home from work do my Emissary WQs and then farm the Dune Scavenger and Leaping Veinseeker mounts. By doing this I have sold 3 BoEs and about 7 mounts totaling around 5 Million gold. So yeah I would say I made a shit ton during BFA. Before BFA I didn't play since Very Early Legion and only had 170k on my Account and spent that to reactivate my game time. So I was pretty well poor AF. I now have a total of 6,223,576g on my Account. If you focus on making gold you will make gold.
The point is the sale price never be the same, and never will, as entropy increases further, the sale price will always drop, since its something that people get and they forget, there inst any reason to buy more than one. So your margins will always be lower than yesterday, if you want to keep your income (more effort same reward), furthermore add scrapbot to the formula and your margins will be lower.
With the most in-demand decks going for up to 20,000 Gold each, Basil believes that Darkmoon cards (12 of which when combined form a full deck) can earn scribes the highest possible WoW Gold. But he said that it takes intricate planning and logistics to really ramp up the Gold income from Darkmoon cards due to the constraints surrounding its crafting cooldown.

I'm aware that the LS chain can be xmuted up all the way up from GIO. This is great since it means ultimately you only need to track/acquire one item. The procs can certainly increase your profit margin, but as I said in my top-level comment the profitability of the whole endeavor is server-dependent. These numbers will of course vary from server to server, and for some it might be worth it.