How to Use Rust C to Improve Your Programming

The next language is rust C. Do you ever call rust C directly or do you call cargo only? I haven't experienced that as scenario where I would use rust C by hand so I always and you would also always probably just interact with cargo. And one of the features of rust C are extensive air messages. Can you explain a little bit about these air messages and sort of how they direct you towards possible fixes? So if you don't adhere to the ownership principle it will tell you like what to do so you comply to the Ownership Principle for example.