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

oldstable, or bullseye         - the released Debian 11.11
stable, or bookworm            - the released Debian 12.11
oldstable-proposed-updates     - possible updates to Debian 11
proposed-updates               - possible updates to Debian 12
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