Governance of the specifications contained in the repository is done by the IDTA
The release of the Asset Administration Shell Specifications can be found here: https://industrialdigitaltwin.org/en/content-hub/aasspecifications
You find the html documentation under the link: https://admin-shell-io.github.io/aas-specs-antora/index/home/index.html
The version "in progress" is not yet released but shows the version in work.
The github repositories dedicated to Asset Administration Shell Specifications start with "aas-specs". The two repositories "aas-specs-antora-ui" and "aas-specs-antora" are used for generating the HTML documentation based on Antora.
The Submodel Template Specifications can be found here: https://industrialdigitaltwin.org/en/content-hub/submodels
The Submodel Templates can be found in https://github.com/admin-shell-io/submodel-templates
Questions often asked and best practices can be found here: https://github.com/admin-shell-io/questions-and-answers
Feel free to add your question as an issue.
You built a Submodel Template or a Submodel or you implemented an API conformant to the Asset Administration Shell Specifications? Then you can validate them, for details see: https://github.com/admin-shell-io/aas-test-engines