Congratulations on reaching Level 120! There are a myriad of new things to do. The first thing you should do is head to your faction hub ship where you have been doing your mission table quests and footholds to pick up and complete the quests necessary to unlock World Quests. World Quests will provide you an opportunity to grind reputation levels, acquire gear, and gather Azerite. There are tons of new things to do that we will cover in our Level 120 Battle Guide found here: Level 120 Battle Guide.
As others have said, there are free alternatives... which is important to consider if the price of the Zygor Guides are a concern. If speed and convenience are more important, then they're worth it. Zygor will take you through the quests in the most efficient way possible, and their customer support and the speed with which they update the guides when changes are made to the game is impressive. I know I went from 80-85 a heck of a lot faster (in /played time) than my co-worker who doesn't have the guides. And we had a bet going to see who would make it first. For me, it was worth it. Your mileage may vary...
Incursions are a new world content activity that are unlocked when one character has unlocked World Quests. This feature is unlocked account-wide meaning that all characters on that account can access Incursions even without being Level 120. This provides for a lucrative experience acquisition method that is available in a similar pattern to what Legion Invasions offered with nearly an entire level earned by completing an Incursion series which involves four World Quests and one mini-scenario at the end. These also grant item level 370 weapons and Azerite armor, so they should be done any time they are up. Incursions follow a similar schedule to Invasions and are available for 20 hours once they are initiated.
Be aware of the seasonality of items. Check what items are used in seasonal achievements, such as Delicious Chocolate Cake or Small Egg during Children's Week. When the Darkmoon Faire is in season, Darkmoon cards and decks (Furies, Elementals, Lunacy, etc.) tend to sell well, but prices also tend to get depressed. When the Faire leaves, prices return to normal, but sales volume decreases. The same is true of things like Snowman kits, Red Holiday wear, etc. Holding onto that Snowman kit for a few months, and then listing it in July, can net you a significant profit.

We opened the Proving Grounds and thousands of players around the world answered the call, completing five different level 14 Mythic Keystone Dungeons to earn their spot on the Tournament Realm. These players will have the chance every second week to compete in the Time Trials for their region, West (North America, Latin America, and Europe) and East (China, Korea, Southeast Asia, Taiwan, Australia and New Zealand). The dungeons and affixes are different for each Time Trial, offering new challenges and fresh chances to make the week’s Top 8, which will be broadcast live in the following languages:
A new quest will pop up once your first pet reaches level 3. It will send you to either Audrey Burnhep in Stormwind or Varzok in Orgrimmar. These trainers will offer a quest chain to battle specific Pet Tamer NPCs on each continent. Defeating each of these NPCs will reward a nice chunk of experience for your pets, as well a Sack of Pet Supplies (which has the chance to drop the Porcupette companion, among the always-useful pet bandages).
As the battle for Darkshore begins, both the Alliance and Horde are blindsided by a new development: High Overlord Saurfang, who had been defeated and captured in the Battle of Lordearon, has suddenly escaped Alliance captivity and is on the run. Sylvanas sends Horde Champions to track Saurfang down, ostensibly to extract him. However, it quickly becomes apparent that the search party is in fact an assassination squad, as Sylvanas suspects Saurfang of colluding with the Alliance in an attempt to dethrone her. While some Horde champions choose to side with Saurfang and help him escape the assassins, other champions remain loyal to Sylvanas and report Saurfang's and the dissenting champions' treachery to her.
While enchanting is generally considered expensive to level, you can make a profit with it as soon as you start disenchanting for profit. It is not unlikely that almost any green item in this case will have a buyout price for a lot less than the materials it disenchants into. Likewise, it is lucrative to check the auction house for green items with unpopular suffixes, such as "of the Gorilla," with low starting bids.
Through out the game, the quest log will be capped to 20 many times.  The guide makes use of maximizing the total amount of quests you can accept at once.  Because of this it is important to follow the guide exactly and only accept quests if the guide tells you to so you won't run into issues not being able to accept a quest.  If you do accept a quest that is not listed in the guide, write it down because you may need to abandon it in order to keep following the guide if your quest log is full.
These books cost 1.000 Gold each and are sold from your BfA gathering profession trainer. As soon as you re-learned your farming profession, use this book and you will get back all of your lost Battle for Azeroth gathering ranks. Your gathering skill remains reset at 1, but you don’t have to care about that since you have your ranks back – thats literally all that matters.
Knowing how to use the Auction House and Mastering the Auction House are two completely different things. The difference between the two reflects entirely on how much gold you have. If you have a lot of gold then you've probably mastered it, if you don't, then you need to get this to Learn to Master it. In this module I cover some of the best kept Auction House Secrets used by the pros.

When it comes to gold making addons, as most of you know, there is one that comes before all the rest, Tradeskill Master. This addon will help you make heaps of gold on the auctions house, and will give you a deeper understanding of your servers economy and the whole WoW economy. Learning how to use it well takes time, so read through all the info on their site and maybe watch some youtube videos on how to set up TSM. TSM will help you appraise items, sell items quickly on the AH and buy items that you can resell for a profit, amongst other things. Additionally the addon will help vendor and managing your mailbox, making this the only addon you need for gold making purposes. We will be coming back to TSM in the Auction house part of the guide.
The problem with Battle for Azeroth’s endgame is that a culling of abilities, the loss of Legion’s legendaries, and a lack of endgame talents means that hitting the max level doesn’t necessarily make your character more fun to play. Your character is a vehicle to explore new content, and it doesn’t matter how stunning the vista is if the core gameplay loop you’ll execute a few thousand times just isn’t fun.

Recipes - provide in-game capability to create more kinds of items, and so are always in demand, BUT be careful; if the ingredients are obscure, and the benefits marginal, or the recipe is too common, this is not a good option. Some otherwise very good recipes drop far to often to hold value - Copper Chain Vest comes to mind. This produces an excellent entry-level item, but the recipe is available for low silver at the auction house.

Finally, Mmo-champion.com provides the latest patch notes in the fastest and most reliable way possible. The information on this site is highly trusted and often sourced with Blizzard developers themselves. By knowing that an item such as infinite dust will drop 50% less, then you would know to stockpile it now while it's still abundant and then mass sell following the release of the patch. The greatest gold makers are the most informed readers! (I can not stress this point enough!).
1. Begin by providing a sell message that is clear and concise. This includes the grammar and punctuation just as much as it does the word choice. Try changing that "Some noob buy my sh!t" into "Looking to sell a ____. Please message me if interested. Thanks!". People would rather see a message that is obviously not from a foreign gold farmer or a younger kid. These sellers are hard to deal with and have the stereotype of scamming the honest player.

This farm is a cool rogue only spot that is more hit or miss rather than a direct gold farm.  Generally we'll be picking pockets for the item Decaherdral Dice.  It's a rare pickpocket drop that ranges anywhere between 28,000 and 35,000g.  The good news is, this spot has soo many mobs that it's literally impossible to run out of mobs to pickpocket, and when you kill them (which you will eventually)  they have fast respawn times.  Within 20 minutes I was able to snag one of these cool toys in the video.  They seem to be rare and have very high selling points.
2. Once you have an interested buyer, stay firm in your price. This does not mean to never make them feel like they are getting a bargain. You can subtract 5% off the price and not be hurt as long as you still make a profit! Remember this, as that 5% may not be a big deal to you, but the buyer will feel special and might buy the item for the slightly reduced price. I can not emphasize enough that this is not the same as undercutting! Do not drop every good every time or you develop a reputation as a soft seller and people take more liberties in their dealings with you. If you give someone a constant 5% discount, then they begin to want 10% and then 15% until you no longer make a profit. Discounts are used when you feel that the seller may be pulling away and you really want to just profit and move on! 
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