In Path of Exile (PoE), resetting skill points—also known as respeccing—is an essential feature that allows players to reallocate passive skill points to optimize or change their builds. This flexibility is crucial given the complexity of PoE’s massive passive skill tree PoE Currency.

How to Reset Skill Points
The primary method to reset skill points is by using Refund Points, which you can spend to unassign nodes on your passive skill tree. Refund Points come from two main sources:
1. Quest Rewards:  
Throughout the main story campaign, you earn Refund Points by completing specific quests. Each quest grants two Refund Points, and there are 10 such quests, giving a total of 20 Refund Points by the end of the campaign. These points are automatically added to your account as you progress.

2. Orbs of Regret:  
Once you exhaust your quest-given Refund Points, you need to use Orbs of Regret to gain additional Refund Points. Each Orb of Regret grants one Refund Point, which you can then spend to unassign a passive skill node. Orbs of Regret can be found as drops from monsters, chests, or purchased from vendors in exchange for Orbs of Scouring (which themselves can be traded up from other currencies like Orbs of Chance).

Using Refund Points
To respec, open your passive skill tree by pressing P. At the top of the tree interface, click the Refund Passives button. This highlights all allocated nodes that you can refund. You can only refund nodes that are at the "end" of a branch; that is, you cannot refund a node that lies between other allocated nodes without refunding the nodes beyond it first. This means deep nodes require multiple Refund Points to free up.

Can You Reset the Entire Tree?
A full reset of the entire passive skill tree is not directly possible unless you have enough Refund Points to unassign every allocated node. Since Refund Points are limited and costly to acquire in large quantities, many players opt to create a new character if they want to completely change their build. For mid-game adjustments or minor corrections, using Refund Points is efficient and recommended.

Additional Tips
1. Plan Ahead: Since Refund Points are limited, it’s wise to plan your build carefully or follow well-established builds, especially if you’re new to the game.
2. Books of Regret: You can also purchase a Book of Regret from vendors using Orbs of Regret. Each Book contains 20 Refund Points, allowing you to refund multiple points at once PoE buy Currency.
3. Cost and Economy: The price of Orbs of Regret and related currencies can vary depending on the league and player economy, so be prepared to spend some in-game currency if you want to respec extensively.