This is a once size fits all pet farm that can generally leave you with a small sum of gold if your server is low on this specific pet. (You can always check on the undermine journal).  It takes place in the Ihgaluk crag and is generally performed by sweeping the oozes in the small muddy pools surrounding the area.  An easy spot to hit, that really isn't farmed all to often.  I was able to get one in the video after a small 24 minutes.
The NPC scan and NPC alert method is an awesome way to build a stock of rare BOE items simply because you don't really have to try.  By installing NPC scan and NPC alerts, you can literally just fly over anywhere and be alerted when you pass a rare spawn.  As we all know, rare spawn loot tends to have higher item vales, as not everyone is able to consistently farm them.  Some NPC's, especially those in outlands have those higher item values when compared to the rest of the world.  As a goldmaking method I just everyone should be doing this.  It only requires you download two addons and you can get access to important NPC,s that you would otherwise never knew existed.  The opportunities are endless, I would generally never play without these cool addons.  Realy cool.
Changes were also made to levelling in earlier content with Legion's 7.3.5 patch. The level-scaling tech introduced in Legion not only be continued in the new continents of Kul Tiras and Zandalar, but was also be applied to content from prior expansions, allowing larger level brackets for lower level zones. Further, as previous expansions are now included in the base game, the level ranges for those expansions are now broadened, allowing players to spend more time leveling in preferred expansions and avoid others entirely. Some examples include a zone like Westfall having its level bracket (at 10–15 as of Legion) increased to 10–60, whilst continents such as Outland and Northrend sharing a 60–80 level bracket. The aim of this change is to encourage more player choice whilst levelling and to allow players to experience the full story of a particular zone without overlevelling the relevant quests.
And if you decide you need to go back to an early zone to get low level minerals or herbs? Instead of meekly wandering around ignoring you to gather in peace, now the local mobs are the same as you again and aggro on you. So you have to fight your way in and out. Same spell rotation, over and over and over. 31373433. 31373433. 31373433. 31373433. 31373433. 31373433. Every combat the same. Over and over again. Never ending. No change. Mind numbing. No challenge.

Mists of Pandaria has a few rare mobs that drop epic BoE’s. Most are in Krasarang Wilds and most drop leg slot gear. Scritch is also very good as you can get the Hozen Peace Pipe from him. The best way to farm them is to occasionally check if they’re up and kill them all in the order listed below. That way you basically just fly through Krasarang Wilds with a short visit to Townlong Steppes, The Jade Forest and Kun-Lai Summit

-Bugs- There aren't too many glaring bugs anymore, but you will certainly encounter some. The pathetic thing is that many of the bugs you'll encounter were reported repeatedly during Alpha/Beta and still weren't fixed. Some bugs were discovered after release and players were able to abuse game mechanics without repercussion unless they were one of the more serious offenders. This gave some players a significant advantage over others because they used exploits and at the start of an expansion, that is the time when it's most impactful.
The guide should advance to the point where you are in the zone's progression. There are a few steps that can-not autocomplete and they should (hopefully) have comments to the effect of -- you need to manually check this step off. -- For some reason you have to click these steps off 2-3 times to work. (the first time will move the tom-tom arrow, the 2nd time unchecks it and the 3rd click advances the guide).
 Mag'har orc - "For untold generations, the orc clans of Draenor battled one another in endless war. But when Gul'dan offered them the blood of his demonic masters, the disparate tribes of Mag'har—the orcish word for "uncorrupted"—refused the dark bargain and banded together to drive out the Burning Legion. United under the leadership of Grommash Hellscream, the Mag'har pledged to one day repay Azeroth's heroes for aiding their cause. As war against the Alliance intensifies, the Horde must call upon the might of the Mag'har to seize victory."
This farm almost did not make this list. Even though I have had only a little luck with it, it seems to be gathering some popularity in the gold farming community.  Although I feel with the recent changes in 7.3,  this farm is very close to dying out.  Generally what you want to to do is pull every mob you can as you venture to the last boss in the instance.  The only saving grace of this farm (if you can call it that) is that some mobs are GUARANTEED to drop greens.  Guaranteed.  Whether or not they drop profitable greens is a different question, however it's a must-mention quirk you get from running this instance.  It also allows you to get your hands on some rare low level blues.