You do not need these for the initial campaign, but they become almost mandatory once you reach the endgame ("Maps").
This is the single most important purchase. It allows you to neatly stack thousands of different currency items (like Chaos and Divine Orbs) that would otherwise clog up multiple standard tabs. path of exile what to buy
You need at least one Premium tab to list items for sale on the public trade website. Regular tabs do not allow you to set prices for other players to see. You do not need these for the initial