it's becoming clear that a majority of people on the team may not have followed the transition's team advice to participate in the interactive tutorials, and I don't know how much of the documentation has been read beyond the simple setup steps.
It sounds as if you observe that the majority of the people are having trouble with git, and you infer that they may not have done the tutorials or read the documentation.
But git has a notoriously difficult learning curve, so my first response is to wonder about the reliability of the inference.
I would start by having a team discussion about how the transition is going: what have they mastered, what are they still having trouble with, what are they confused about? Did they find the docs/tutorials helpful? Do they want a team wiki page with documentation written by the team, containing project-specific examples? Who (else) on the team has git expertise, and can be asked for help? How would they find it most helpful to proceed?
I would strongly recommend the team wikipage, because no matter how good a general tutorial is, a concise project specific cheat sheet with clear notes on how to do common project tasks is an incredibly helpful crutch for climbing up the learning curve.
Some things I would offer as possible ways to proceed:
a group walk-through and work-through of the tutorials, so people can ask questions and make sure that everyone has the same understanding of what's going on and is using the same workflow.
a git training day, with snacks provided by me, where everyone mostly works through the tutorials independently, but can ask each other questions.
add training stories to the next sprint that, if possible, also have some minimal project value. For instance take some trivial bug fixes or tech debt or even documentation tasks, if you're keeping your docs in the repo, and go through specific workflow steps.
an entire sprint devoted to Learning Git, in which the sprint goal is that each team member has demonstrated a desired level of mastery, and the stories are defined by the team as helpful steps in getting there