Get headhunter in PoE
Players can get a lot of different attributes in PoE, but not all equipment can attract the attention of players, players are often keen to discuss that rare and powerful equipment. As far as the belt is concerned, there is a popular item here: Headhunter.
Headhunter is probably the best belt for most setups in Path of Exile, but getting your hands on one of these belts are very difficult. The reason people want this belt because of its unique effect: “When you Kill a Rare monster, you gain its mods for 20 seconds”, which is very powerful!
The problem with Headhunter is that it can only drop in areas that are affected by the Nemesis Mod, and apart from Nemesis Leagues, the only way for this to happen is by having Zana at level 7, and spending 8 PoE Chaos Orbs to activate the Nemesis Mod on a map. Once that is done, any mob in that area can drop the Headhunter belt, but it is extremely rare!
Chancing for a specific unique is very rare. Some guy who chanced a lot of leather belts said he got a headhunter every ~7,700 leather belts on average. Just think of every leather belt that drops for you and you chance as just being a drop. Sometimes you get very lucky with drops (headhunter), and sometimes you get crap like some magic belt with bad affixes.
However, you can also use Orb of Chance to get a Headhunter, and most of the belts are actually “created” this way. You can use Orb of Chance on any Leather Belt in order to get Headhunter, but you must do this in an area with the Nemesis Mod. This basically means another 8 Chaos Orbs to Zana, and bring as many Orbs of Chance and Leather Belts as possible. Again, it is extremely rare, so be prepared to spend a few thousand Leather Belts and Orb of Chances.
A third way to get it is by trading Divination Cards. You can trade 8 of The Doctor for the belt, but these cards are also extremely rare and expensive. 11 of The Fiend will get you a corrupted Headhunter, but these cards are also very rare. Also, other cards like The Valkyrie and Jack in the Box can give you Headhunter, but this is very rare.
As with any other items, you can buy Headhunter from other players just like buy exalted orbs. There are usually many for sale at Poe currency trade website, but they are very expensive!
During the Legacy League, you can change and find Headhunter in any area that is affected by the Nemesis Leaguestone.
In general, to get a satisfactory gear, you need a certain amount of patience and random luck. Of course, the premise of this is that you are willing to spend time searching for them in the game, do not thereby lose the fun of the game.