You can pretty much ignore white things unless you're going to head back to town and have the room to spare for poe currency them. Rarer things are often worth picking up and selling, even in the event that you have to hold onto them for a while. And of course, any product that appears better than your current equipment is worth catching -- even in the event that you need to lose something else temporarily as you equip it.
Don't neglect life and mana regeneration
By default, characters do not regenerate life however they do regenerate a tiny quantity of mana every second. You are able to manually synchronize life and buy poe orbs mana using the proper kind of flask. Flask charges automatically refill when seeing a town or hideout. In addition they profit charges from killing enemies. Equipping better flasks increases the amount of daily life or mana regained, and may have other effects as well.
Nevertheless, you will have difficulty in the event that you simply rely on flasks for life and mana. Gear and passive skills can increase regeneration for Path of exile knowledge either stat or even steal life and mana from strikes and kills. Taking into consideration the life and mana restoring properties of gear is important to keeping your health and mana pool upward. At bare minimum, you want to have some life regeneration so it is possible to regain health between battles.