Blade Dancer: Lineage Of Light

Easy money:
Beat the Morzad King, then use the Lighbra Gate to teleport to Jade. Go to
Market Plaza and speak with Mahatma. You will find Mahatma near the entrance
to Port. He will offer a mission. Accept it and deliver supplies to either
Rem Village or Domerune Port. - Speak with the clients at the location you
choosed (Rem Village or Domerune Port) and you will get an easy 2,000 gold.
You can repeat the process as many times you want.

Easy money:
After you defeated the demon wolf and Gozen joined your party
(about level 10) go to the Jade City. Enter to the crafting store.
Purchase Steel Blades (300 gold) and Hardbone Hilts (150 gold) and create
a Saber. You can sell this Saber for 1,000 gold, and you will earn 550
gold. Save the game often. If it fails to craft, you will only lose the
cheaper (150 gold) Hardbone Hilt.

Dark swords:
When arriving Domerune Port and once the Magic Blade is available for
sale, you can create the Dark Sword. Use crafting for 750 gold and you
can create the Dark Sword from a Hardbone Hilt and Magic Blade.
You can sell the Dark swords sell for 5,400 gold.

More damage:
When using a Group Lunability, there will show a circle expanding and a
circle expanding inside of it. When that inner circle is about to become
the outer circle, just before it becomes a full circle push X.
Your Group Lunabilities will do much more damage