Earning gold in World of Warcraft: Classic is all about optimizing your spendings. Back in the day, your character’s skills were acquired from a trainer, using money. Don’t just buy everything he or she offers! Read the skill descriptions and be mindful about them. Quite a few characters can live through the levelling process without learning some of their utility or damage spells. These won’t go anywhere and you’ll be able to learn them later on. 

This is something that people really need to start to understand, not just for Classic or WoW but software developement in general. Fixing a bug isn't just flipping a switch or changing a single digit. You have a machine with literally hundreds of thousands of parts, designed by dozens of different people at different times over the course of 20 and more years. You change a single thing and it might break 50 other things in very subtle ways that might not even emerge until months later (i.e. the very high M+ keys some players got at the start of BfA).

Before work began on World of Warcraft: Classic, it was only possible for players to experience the original World of Warcraft by using private servers, which are illegal, often have stability or corruption problems, and generally are very imperfect recreations of the authentic World of Warcraft experience. As much as Blizzard has been aware of the desires of their community, until recently it seemed impossible for them to emulate Classic servers due to the technical hurdles of essentially having to run two massively multiplayer online games side-by-side. A breakthrough was then achieved that made it possible to run Classic servers on the modern architecture of current World of Warcraft servers.
If your pet's health gets too low or its attacks aren't very effective against a certain combatant, you can always switch out your current pet with another companion on your team. Only pets that are considered active (i.e., those in your three Battle Pet Slots), may be switched in and out during the battle. Once the match is over, you can always change up your active pet team, which is useful if one of your pets is low on health or dead.
You can profit with cooking, as Savory Deviate Delight was much in demand in vanilla warcraft.  I got mine from mobs in the Barrens, but I believe the pattern also drops from mobs in Mulgore. Either way, the raw fish comes from the pond/lake at the Oasis outside Wailing Caverns.  The cooked fish doesn’t just turn you into a pirate or ninja, but you can also gain faster casting time, or +rage for tanks mid-fight, +energy for rogues.  (Not for feral druids. There is no such thing as feral druids in classic, they’re all healers with the occasional moonkin!!)
Where to get materials and reagents you may ask? Buy for cheap off farmers in bulk or track Auction House lots. Get in touch with most big sellers. Communication is important here, send a whisper or write them a letter. It would be good for both of you to establish business relationships. Constant suppliers and buyers is convenient for both parties to save the time and effort.
Sorry! No addons (unless some are made specifically for the new release of Warcraft Classic). Also, Bidding Is A Thing.  There were bidding wars for the most expensive items on the AH, which you can only find in IF and Org. There might be bidding wars for the rarest of items on trade chat or the realm forums, for things such as the Hide of the Wild pattern. This drops from Dire Maul, Knot Thimblejack, by the way.
Unsurprisingly, the Tauren of Highmountain have chosen to join their cousins in the Horde. In order to unlock the Highmountain Tauren, you need to complete the main Highmountain storyline, which, if you’ve leveled through Legion, is probably already finished. You’ll also need to earn Exalted with the Highmountain Tauren. The majority of this reputation will come from completing the main storyline, and the rest can be earned from doing world quests in Highmountain.
If you’re eager to claim your character name in WoW Classic, take note: we’ll be opening character creation on Tuesday, August 13.** Players with an active subscription or game time on their account will be able to create up to three characters per World of Warcraft account. We’ll have more information on realm names closer to launch, but rest assured—you’ll have plenty of time to figure out your plans for realm domination!
Recruit-A-Friend (RAF) is heading into the workshop! The longstanding RAF program is going on hiatus while we construct something new that makes it even more rewarding to introduce your friends to World of Warcraft. As of June 11, 2019, the current program will come to an end, and you’ll no longer be able to send new RAF invitations. Don’t worry though—the program will be back in its new form before you know it.
Things like the Fishing training book from Booty Bay and the First Aid book from Stromgarde (A) and Brackenwall (H) will fetch a very good price, but even the less rare items like Undermine Clam Chowder recipe (from Steamwheedle Port, Tanaris) can sell well.  The Limited Supply routes in capital cities in Legion is still the same route and vendors as back in vanilla.  Become a Patreon to The Gold Queen and see the limited supply routes for IF, SW, Darn, Org, UC, and TB, as well as the Booty Bay special, in videos as part of the gold guide I’m still crafting.
Within the context of Classic, the method most frequently proposed is to re-tune bosses to make them harder. Rather than copying the numbers, re-create the relative difficulty. Kind of like, when you first start working out, you use small weights. When you get stronger, you lift bigger weights. The WoW community is more knowledgeable, more experienced, has better hardware, etc. We're "stronger." So give us tougher bosses. There are a lot of forms that could take. Bosses were constantly re-tuned during vanilla anyway, so if Ragnaros does 10% more damage or something, is that really a problem? I don't think it is. What about resistance gear? back in the day, collecting resist gear was a thing people did. But the numbers and strategies are so well known today that only the tank really needs it anymore. Bosses could be re-tuned with more resistible elemental damage so that's important for entire raids to gear appropriately. That would be entirely keeping with the spirit of vanilla even if the actually numbers sitting in a database somewhere were different than they were ~13 years ago. If you want to go a little farther, a few people have proposed adding new abilities to old bosses, adjusting their timing, etc.
Use (“V”) to show all the patients status on screen. You will have special triage bandages (add them to your action bar/hot key) which should be applied to Critically injured, then Badly injured, and then injured. Once you started treating a patient do not interupt, just finish treating that patient before moving on to another patient. You should select your next patient before your are finished with the first one, then all you have to do is hit you hot key to start the next one.
Things like the Fishing training book from Booty Bay and the First Aid book from Stromgarde (A) and Brackenwall (H) will fetch a very good price, but even the less rare items like Undermine Clam Chowder recipe (from Steamwheedle Port, Tanaris) can sell well.  The Limited Supply routes in capital cities in Legion is still the same route and vendors as back in vanilla.  Become a Patreon to The Gold Queen and see the limited supply routes for IF, SW, Darn, Org, UC, and TB, as well as the Booty Bay special, in videos as part of the gold guide I’m still crafting.
Unlocking the Nightborne is a fairly straightforward process and, if you’ve been playing Legion, you’ve probably done most of the work. For starters, you’ll need to complete the main Nightborne storyline in Legion in order to unlock the “Insurrection” achievement. Completing these quests will go a long way toward earning you the Exalted reputation you’ll need. If you’re not quite there, then you’ll need to grind out Suramar world quests, though it shouldn’t take too long.
For the duration of the fight, creatures in the immediate area will not be visible to you (but they may still attack you if they wander too close). Keep in mind that other players will still be able to see you and attack you if you are eligible for player vs. player (PVP). Other players will also be able to view your pet battle in real time, including the pets involved as well as their health as the match progresses.
Only really to expand on Gráinne's comment as regards the 'collecting' and 'roster development' sections - which are, as said 'distinct' although they are intrinsically linked - I would like to point you in the direction of the in-game Achievements > Battle Pets > Collect tab. There are a series of achievements called Raiding With Leashes, pretty much all of which can be completed via the auction house - if you have the gold/inclination - or by completing old raids.
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