Best way to make gil in this game?

[Tatsuguy]

I try spirit bonding last night. I got a crit 4 materia that sold for 1.3m and some int 4 that sold for 300k. Everything else was junk / npc.

Made about 1.6m profit but I got lucky I would say. Seems like a bit of a gamble could of got 0 worthwhile materias. But I am happy I made some gil. Not sure if I should try it again or not.

You could try and do DoL/DoH and just spiritbond while doing that while making money off gathering/crafting. Alot of stuff you can just craft and then sell for npc for profit.