Each of those modes existed long before this latest expansion; raiding is a basic concept in MMOs, and Mythic+ was added in World of Warcraft’s last expansion. The problems with Battle for Azeroth’s endgame come from the systems it adds, which most often artificially gate progress where most of the fun can be found. If raids and Mythic+ are the carrot, we’re about to talk about the stick.

5. at least get 4 characters with these professions. Tailoring/Enchanter; Minning/jewelcrating; Minning/Blacksmithing and Herbalist/alchemist. You can skip blacksmithing and take Minning/herbalist with 1 of your alts. While doing your world quest in argus, try to get all the ores and herbs that you can. Send all the cloth and greens to your tailor character.
Okay, this farm really picked up steam here in late legion.  Generally what we're looking for is volatile air, and other volatiles when combined with the potion of treasure finding.  This farm is as easy as pulling the entire instance all the way to the first boss – and AOE'ing down ebery mob that follows.  In the video you can see me getting volatile airs in stacks of 11 for each pull I make.   Wit the trending price of each volatile being worth at least 100g, I was making 1100g per pull.  It's by far the most effcient volatile spot, but it has hits limits as you can only reset an instance 10 times before you have to wait a while to do it again.  If you only going to be on for an hour or so, this is the spot you want to hit.  It's great, fast, and awards a high liquid value of items.  Awesome Stuff.
When assigning a selling price, do not aim for too low a price that would give you too little profit, but certainly do not assign too high a price. Too much greed is never a good thing, and the AH is filled with items that do not sell due to excessive inflation. A very common tactic in the AH is to sell for lower than what another player is offering, and many players make a lot of money that way. Similarly, losing sales thanks to being undercut is never fun. Aim for as low a price you can that will still make you a good profit. If you can keep producing the same item over and over, sell cheaply yet make a good amount of the item, you will reliably make a lot of money by volume. Moving inventory is the best kind of inventory.