Glim

good ways to gather
ride a mount through a patch of grass. The best way if you have no time to plant

planting
if you got the gardening bench craft as many level 1 grass seeds as you can and plant them all. After the hour you can finally run them over and gather some glim. The second best way but the slowest. Only adviced to do it if you got no time for adventuring at the moment, and going to shut down.

loot collecting
fishing is definitely a good way to start cause you can catch fish whenever you want. Just need lure, a rod, and then just fish! The best part is the fishing rod can be bought cheap with 250 glim and the lure 10, 90, and 900 glim for lure.( the more you pay the more lure you can get)

if you get a common fish it is about 1-10 glim, uncommon [25-50] rare [guaranteed 1,000 and a ancient scale]

Traders
some people trade glim for flux. And the price can get high but it could lead to more glim. Also some use trading post trading and might give glim or flux along with other items (that could be useful).

enchanted forge
the forge is the hardest to understand but if you do glim is needed to create stellar auras.

traded for
1 glim for 1 flux so get large quantities of glim to turn it into flux.

market place trading.