How do you tag your python docker images? How should I tag my docker images? Are there any standards and/or widely accepted conventions?

I’m aware of latest pointing to the latest stable release. So my question arises with respect to other cases:

1. What’s the standard tag that points latest git commit? docker-metadata says edge. Although I’ve seen branch name being used for this purpose as well.
2. What’s the standard tag that points to a specific release? v1.1.1 or 1.1.1

Are there any python specific conventions I need to know?