The most important part of saving is to never buy equipment unless you're positive that it will increase your earning potential, or significantly speed your character's leveling progress. While it is true that gear is important (particularly for melee combat characters), it is also true that an overemphasis on having great gear before maximum level is dumb. Who cares if you're wearing a green sword at level 43? If you're advancing well, you aren't going to be level 43 for very long anyway. The only gear that currently "counts" is max level gear.
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!).
-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.
I'm just now coming back to WOW and TSM after a long time and boy has this incredible addon changed! Right now I'm leveling all expansion version of inscriptions so I'm able to craft all the illusions. I created an All Herb group from this import ( https://www.tradeskillmaster.com/group-maker/ogth3m9d ) but when I search this group in the shopping tab you see it is searching all items (Scanning x/120 in the status). However, only BFA herbs are shown. I verified that this group is using the default, stock shopping operation and validated that operation was indeed stock. What am I doing wrong?