The same manga was animated twice, and the older version only finishes its story in OVAs that were never released in English.
Pick one adaptation and stay in it. This site says the 2011 series, all 148 episodes, because it is the only version that tells the whole animated story in one place and the only one you can legally watch in English. Do not alternate between the two versions and do not treat the 1999 episodes as a prequel to the 2011 ones.
Seen some of these already? Tap the circles to tick them off. The full list below fills in as you go.
The Hunter Exam and the trip to the Zoldyck house. Nothing comes before it, and this stretch is where the series decides whether you are in.
Heavens Arena, which is where the power system is finally explained properly, and then the opening of the next arc. Short and load bearing.
The rest of Yorknew City. This is the point the 1999 television run gave up at, so anyone comparing versions should note it.
Greed Island. The last stretch the older adaptation covers, and after this the two versions have nothing in common.
Chimera Ant, sixty one episodes and the longest single run in the series. It has never been animated anywhere else.
The Election arc, which closes out the consequences of the previous one. It is the end of the anime, not the end of the manga.
Then what? That is the whole 2011 series and there is no sequel season. Everything after episode 148 exists only in the manga, which has been on and off hiatus for years. The 1999 series and its three OVA sets are worth watching afterwards as a second version of material you already know, in the order 1999, then the 2002 OVA, then Greed Island, then Greed Island Final, and never before the 2011 run. The two films are original stories that the series does not refer to, and the 1998 pilot is a curiosity.
A suggested way in, not an official one. The full list is below: tick anything off in either place.
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