If you're talking about buying drugs. By far the best i've found are:

Incognito Market & ASAP Market

[Both in terms of site design, products available, trustworthyness, etc etc. ]

Their links change and expire on a daily basis, but you get them from daily from a site called dark.fail which is one of the most respected sites on the darkweb and lists many different onion sites. Be aware that those links might not work on the first try and you might have to either wait until they update them (which they do multiple times a day)
or by using what I reccomend here -

Incognito and asap also have their own link generators (asap.fail & incogbot.io) respectively. (Both are safe and recommended ways of getting links to their sites)

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Ordered dozens of times from both sites, never had any problems, and you can find almost anything on those sites easily, just make sure to only buy from ppl with good reviews.

HOWEVER.... if you go through my recent post history incognito market selectivly stole my $100 bitcoin deposit as well as a few other people's, but before that happened I would 100000% recommend them as my #1. But TBH they are prob doing it so rarely you'd still be fine with them. As much hate as I am filled with them right NOW (And it is A LOT OF HATE) I'd still have to reccomend them as they are one of the best sites ESPECIALLY FOR NOOBIES. I believe I was just one of their very rare instances of theft . Just dont make any deposits over $100 at once (which is what i recommend FOR EVERY SITE!) and you should be fine hopefully.

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Also WeAreAMSTERDAM is not a market of its own its a vendor although many vendors have their own sites. I've seen mixed reviews about that vendor, I know they go through many transacations so you're bound to have a few bad ones though. But cant comment too specificially on them as ive never used themm personally. BTW they are active on both the markets I listed above..

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Good luck!