Maybe start with python, either Django REST framework or FastAPI, and make a todo app. Start somewhere writing your own API and learn what the backend feels like, then when you work with other people’s API you’ll get what’s probably happening behind the scenes and know how to read between the lines with the incomplete documentation.
I’d also say take a look at GraphQL, that is another popular paradigm that’s related.
It’s easier to get a warrant for his arrest from a grand jury for manslaughter because it doesn’t require motive, just a dead person. They can always upgrade that too murder if the investigation turns up something.