The bones of Mythic+ are fairly simple, but it’s that simplicity that makes it Battle for Azeroth’s most rewarding mode. It’s fun, generally only takes about 40 minutes per dungeon and allows small groups of players to push themselves exactly as hard as they’d like. Battle for Azeroth’s dungeons are extremely well-designed and consistently entertaining, even after doing some of them 20-plus times, which makes the challenge of Mythic+ a great way to keep people playing.
Keep in mind that these quests are optional, and are not necessary to continue leveling and capturing companions. They are also account-wide, so if you complete the quest chain on one character, you will not be able to complete it again on another. However, any progress that you've made will be saved and you can pick up where you left off in the quest chain on another character. The dailies that you've unlocked will also be accessible by all your toons.
Similar problems have risen in the leveling system, which automatically scales to the player’s level and equipment. For the most part, you’ll vaporize enemies more quickly as you gain power, but there are some weird dips. Many players complained they felt less powerful at level 119 than at level 110, a problem I experienced myself. And world PvP remains a strange and whacky world where level and class balance issues make wins and losses feel destined instead of earned.

World of Warcraft: Battle for Azeroth also provides you with the opportunity to quickly upgrade your character to level 110. Enter the enormous battle fully prepared for it. After you start the expansion, you will sail to the kingdom of Kul Tiras and visit the trolls of the Zandalari Empire. Win epic battles and take control over the strategically placed Stromgarde. Discover a twenty-player cooperative missions on the War Front and take part in numerous expeditions. Gather resources scattered over treacherous, undiscovered territory.
Time Trials for MDI take place during a 72-hour window on the Tournament Realm. The first Time Trial window begins Saturday, March 23 at 7 a.m. PDT for MDI West (North America, Latin America, and Europe), and Saturday, March 30 at 7 a.m. CST for MDI East (China, South Korea, Southeast Asia, Taiwan and Australia/New Zealand). When this time window begins, players on the tournament realm will receive a quest with three Blizzard account-bound keystones from this Turnip, found in Hook Point (Alliance) or Mugambala (Horde).
An alt (low level or no) in a capital city is an effective way to not only cheaply increase your available bank space, but to be a simple savings and auctioneer account. This character can serve as your bank, an auctioneer, bag-space creator and a time saver. Get one. (There may or may not be Item Recovery issues with characters below level 10, in cases where one's account is hacked.)
After completing your island expedition and second foothold, head back out to your third and final zone to quest in. Note that any legendaries you were using to level have become inactive and are merely stat sticks now. Feel free to replace them with quest gear as you obtain it. Before heading out, feel free to send your three champions out on new missions!
Most people come here not to read walls of text, they look for the better-rated strategies that match their pet collections, copy&paste stuff they need to import into their addons and only come back if something goes horribly wrong and then mostly to find help in other peoples' comments who also struggled or to find a different team/strategy: I don't think many people wanna read about stuff that already happened to them, they mostly want to see solutions and it's the best way to have them in a well-optimized strategy&team already.

No he's just not paying attention. The wanted quests are built into both the leveling guides and the "Zandalar Forever" achievement guide. They aren't in the rep guide because they are not repeatable and by the time you hit max level they should be done. You'll also notice the rep guide doesn't contain every single possible completable quest that rewards rep. It is designed to focus on repeatable objectives, world quests, large quest lines, and missions.
As late as possible. Early on, you’ll want to follow the missions in Battle for Azeroth right up until you get the option to send a follower on a two-hour long quest. As soon as you get there, stop doing the War Campaign missions. You can come back to them once you have reached something like 119 and a half and finish leveling with those if you want. If you don’t use these missions to cap off your leveling journey, then they’re the first thing you’ll want to do once you reach max level.
You will need to cover very large areas in order to get a few chests as they are quite rare. Vanilla, TBC and WotLK zones work best. The way I like to do it is to park one Rogue class trial in Outland and one in Northrend, then fly over the whole continent and look for chests. One whole run might only yield 3-10 chests but you will still make a bunch of gold as you are almost guaranteed rares in chests in these zones. 
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