Other Survivors could somehow learn new Survivor Skills through a process that the others called Repeated Practice. This could be done just with your own experience and with the help of your current Talent.
This was the reason why many Survivors developed skills related to the Talent they possessed.
Unfortunately, for some reason, Shane couldn't do that… Continuous cooking, wood crafting, mining, or even dancing won't allow him to acquire the skills related to those activities. However, once he obtained them, he could at least increase their proficiency with Repeated Practice.
Because of that, he was really interested in Dylan's Workshop, which could allow him to acquire new skills just by adding some tattoo marks.
Currently, he only has one tattoo mark and it was on the back of his left hand. It was the level 20 Mechanical Proficiency Skill that allowed him to trigger his Otherworldly Mechanic Talent a lot easier.