Best cross-class skills for leveling?

[johnbeck1000]

Hi! Recently just worked my way to have all crafts to 15, while my GSM is at 45.

I haven't had much of a chance to toy around with cross class configurations, and I'm hoping someone here can point me in the right direction while I fool around with it on my own.

Leveling Goldsmith to 45 wasn't a problem, but if using these other skills makes my next crafts easier to boost up, I'd like to do so.

Thanks again.

All of them are useful, I don't really care for Manipulation personally because I feel Waste Not is more useful for a cheaper CP cost. Curcio, when I unlock a cross class I play around with a rotation and also play around with how it works and how I can manipulate it to work for me. That's what I really suggest, just use it.