C isn't a language that lends itself to bootcamp-stye learning.

With Javascript, you can get something on-screen in a few minutes, and even if you make mistakes, you will normally see something. It's a more forgiving environment.

With C, a small error prevents compilation at all, and it's going to be a relatively long time before you're ready to progress past the "printing text to the console" stage.

C is flatly harder to learn, and unless you're the kind of person who likes mental challenge, it's less rewarding than Javascript. It isn't the kind of thing you tackle because you need hirable job skills by the end of the month.

There are still some excellent C tutorials out there (for example, I think Handmade Hero's[0] intro to C is good, and Handmade Hero itself gets you to the "shiny colors on the screen" stage very quickly), but HH has a different mentality than a bootcamp. HH is about learning, exploring, breaking things, and figuring them out on the fly. A bootcamp is about gathering the minimum knowledge necessary to be productive as quickly as possible.

[0]: https://www.youtube.com/watch?v=F3ntGDm6hOs