You need to both dry your filament on occasion, sometimes straight out of the box (just because it's new doesn't guarantee it's not wet) and also keep it dry.
This is particularly the case if you live in a humid environment. Wet filament can cause bubbles in your prints making them look bad or just a complete mess on your first or subsequent layers. One symptom of wet filament is spitting when the filament exits the nozzle at temperature.
To dry your filament you'll want a decent dryer.
A really good dryer, which I have, though also a fair price but possibly one of the best ones on the market at the time of writing is the Eibos Cyclopes which can dry 2 decently sized 1Kg spools at once - it gets up to 70C and achieves 10% humidity in the box while having fans to release humidity. I ordered mine direct from the Eibos website.
Depending on how many spools you have you will also want to store them in a dry location. A dry box comes in here. In an ideal world you'd want a vaccuum sealed box but they cost a fortune. So, I recommend some kind of large 80L approx plastic container with a lid that you can layer the base inside with silica desiccant beads.
NOTE: you do NOT want the blue desiccant as that is cobalt based and toxic. Go for the orange beads.