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.
The recruit also grants the recruiter levels, with the latter gaining one level for every two levels the recruit gains. There are a lot of rules and restrictions to that, however. It all basically boils down to leveling alternate characters together. The recruiter can even earn epic mounts and battle pets if you stick with the game for a couple months.
A stable for any healer. While not every healer uses this, those that do swear by it. It allows you to set spell combinations so that every ability you use is at its optimal effect. Healers have a large range of buffs and healing abilities, and Healbot lets you use the best ones you need when you need to. It’s a great organizing tool for any healer.
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!).
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The most simple thing is TradeSkillMaster. This AddOn shows you quite an amount of information in the items tooltip. In my opinion, DBRegionMarketAvg the best source. It tells me the price, an item was posted on all EU realms in the last 14 days. Why not DBMarket? DBMarket only shows you the items value from your server in the last 14 days. This value often gets manipulated. Some people start to post an item with a 500g value for 500.000 Gold on the auction house for several weaks. As a consequence, DBMarket is rising towards 500.000 Gold. If you use DBMarket with 100% and post your item for 500.000 Gold, nobody will buy it.