This directory, dists, is the canonical way to access the distributions.
Each distribution can be accessed by name or state from here.

oldoldstable, or buster - the released Debian 10.13
oldstable, or bullseye - the released Debian 11.11
stable, or bookworm - the released Debian 12.10
oldoldstable-proposed-updates - possible updates to Debian 10
oldstable-proposed-updates - possible updates to Debian 11
proposed-updates - possible updates to Debian 12
buster-updates - important updates to Debian 10
bullseye-updates - important updates to Debian 11
bookworm-updates - important updates to Debian 12
testing, or trixie - the development version of the next release
unstable, or sid - untested candidate packages for future releases
experimental, or rc-buggy - experimental packages to be used on top of unstable