Every other month artists are able to apply for the 256ART journey. At the end of said month, a snapshot proposal is created where membership holders can vote on the artist they would like to see join 256ART. Votes are weighted based on the amount of memberships you hold. Snapshot: https://snapshot.org/#/256art.eth
Members have 24 hour pre-sale access to all mints. During this pre-sale window for each membership you hold, you can mint one piece. After the 24 hour window, mints will be open for the general public as well. Please note this does not mean you are guaranteed a mint as collection sizes might be smaller than the amount of memberships.
Ocassionaly there are art series that are exclusive to 256ART members. These series use the data inside your membership (aka 256ART genesis piece) as part of the input for the artwork you mint.
LooksRare: https://looksrare.org/collections/0x44E4aFA4b442f11693844d425fB29aEDDFA0F33E
OpenSea: https://opensea.io/collection/256art