If you’re starting out, you should ideally try to hoard everything you can. Every single item and resource will be useful to you at one point or another.
So, if you can avoid it, try to not sell any of your items.
Later on, as you get more used to the game, you will start to notice which items you can do without and sell. But early on? Try to hoard absolutely everything you can.
Again, instead of selling anything, consider just keeping it all. Alternatively, consider trading with other players instead of selling things.
The only exception to this rule is probably the Old Currency items. These are basically only meant to be used to trade for cash. Still, some players like to use these in trades.
As said previously, you will eventually start to realize which items you can do without. Complete all quests or exhaust your upgrades and you won’t have use for these items.
When that happens, consider trading them with other players or even just giving them away to your friends if they need help.
Venezuelan gamer cursed by being interested by most games, resulting in a ridiculous backlog he’ll never be able to conquer. Been gaming for over two decades now! Few things exemplify his wide variety in gaming tastes as the fact that he’s a big fan of both Souls games and the Atelier series at the same time. Also a big fan of Yakuza/Like a Dragon, Deadly Premonition, Zero Escape, and Dead Rising, among others. Considers Lost Judgment and Sekiro to both be masterpieces.