Earning Gold

1) Daily Challenge and Daily Quest
As said in the guide previously, this is one of the best way to earn gold.

2) Weekly Challenge and quest
This is easy money and mats! Too bad, its once a week.

3) Dungeons loots
Certain items are very valuable and people will bid high for it! Especially legendary items such as Oath necklaces and such.

4) Farming essence
This might be weird and might not yield very good result, but you can earn some gold doing this.
2 most popular essence are Golden Deva and Scorpio found in near Yehara Mirage. I personally tried today (23Jan2018 in case it gets outdated), I sold 0.2g for each essence. Golden Deva drop 4 when solo essence while Scorpio drop 3 when solo. Solo can also means dealing one of the highest damage to the boss, other hitting it will get 1 and you can get 4 or 3 too.
There are often some people around, but not a lot.

5) Celestial Basin Boss
There will be a chance to drop Evolved Stone which can be sold


6) Soulstone plains
Killing the big mobs will drop a chest that may give you Soulstone plains key which can be sold.
Killing the captain after mining phrase with either drop captain badge or defense captain badge which can be combine to form a chest that can be open with Soulstone Plains key to get Evolved stone and moonstone crystal.
You do not need to solo to consider having a "kill", as long as you deal some damage. One hit is not enough, it takes a few hit.
Farming prestige points can also be exchange for soulstone. But not recommended because it takes too much effort and time.

7) Trading
Of course, trading!
Items price rise and drop! Always look at the market to get yourself familiar with the price if you want to be a pro trader! Predict which item price will increase too by reading updates for the future and invest them! People will want to clear their item sometimes for cheap, so its good that you know the price well.
Some items good for trading are:
Premium Transformation Stone
Transformation Stone
Empyrian Stone
Soulstone
Moonstone
Scared Orb
Elysian Orb
Evolved Stone
Gem Powder/Fragment
Pets and Pet pod
Sacred Oil

8) Crafting
Count and check carefully, and remember about the market fee so see if its worth to craft or just to sell mats away. From my personal opinion, is pretty hard to earn of crafting. Maybe you realised something I didn't? Check it out anyway :)

9) Skybreak Spire
Completing the weekly quest itself gives you around 50g
Element acc are often 100g min bid while SS 10g min. However, items often go up to 300g-400g, and rare item can easily go up to 1k.
I have earn 500g in one run before because everyone was bidding a lot!
So gear up and heads towards BT :D