Farming Gil can be done, efficiently in a few different fashions depending on which play style you prefer. However either way, it's about making the most Gil in the shortest amount of time. The most effective way to make a lot of Gil is done at level 60, when you have access to the highest class skills and can farm lower level areas, with ease. What we've devised is a system to implement farming techniques while leveling and then the serious grind at level 50. Below is a list of ways to grind Gil, fast as you level up and then the end-game grind will follow. So if you're only interested in the end-game grind, feel free to skip right to it.
Grinding Gil early on, is really rather difficult. Most methods employed (Crafting and Leve grinding) can't even be learned until you've completed the "Level 10 Quest" for your Battle Class. Once you've gotten that out of the way, you'll be able to learn crafting and gathering classes. For game-farming purposes it is advised to take at least one gathering class and either alchemy or culinary. As all of the products of these professions are and will be greatly sought after by other players. Also, pay very close attention to quest rewards, if you're already relatively well geared, take the monetary bonus instead of the gear, as low level gear is replaced rather quickly anyways. It is wise to try to not have to sell items to a vendor, as they really don't help your coin purse any. You'll find that you feel more inclined to purchase items than to sell any. And any crafting items that drop from monsters during your travels should make their way onto the Trading Post Boards, at a competitive rate, or 300% of their "retail value". This will gross much Gil, specially in the early age of the game, as everything is needed by someone!
The aforementioned is a great way to farm Gil up to level 30, though it can still be utilized as an additional method of farming there are some other tricks available to you, once you've reached level 30+. Firstly, with crafting skills (Blacksmith, Armorer, Carpenter, etc.) you'll be able to start crafting some seriously useful , some to be turned in as levequest hand ins and others to be sold on the Marketplace. In each Crafting Class list will be a "a" which will signify a fruitful craft. If the Craft is highlighted in gold. Then it is something that will remain popular on the market place! This will assist with choosing which Crafting Classes to level, depending on your end-game goals!