Many developers view git (and other "helper" tools like text editors, linters, grep, SQL, ... everything but their programming language) as second-class citizen

Many developers view git (and other "helper" tools like text editors, linters, grep, SQL, ... everything but their programming language) as second-class citizens. The way to teach these tools is to make them primary citizens in your company culture. Emphasize that, without a strong grasp on a variety of important tools, devs will be unable to perform at or above the bar. Don't promote anyone to "senior" engineer who can't easily show the benefits of these tools while a junior engineer pairs with them. Otherwise, developers will teach themselves the absolute bare minimum necessary to get their jobs done and go home. The quality of the training materials is of minimal importance. I learned git because I wanted to be better at it.