Examining the types of glowing spots scattered throughout the world allows you to obtain a small amount of EXP, Fol, SP, and different kinds of items.
While the Harvesting specially allows you to harvest from certain locations, you must learn the Excavation and Fishing ones as well if you are to identify and harvest from all the possible locations in the world. You can learn Harvesting right away as long have the SP, but you cannot unlock Excavation and Fishing until you progress in the games. Finally, the higher these specialties’ level, the more you can gather.