Start by writing a few basic hello world style programs while focusing on the "C way of doing things" - most importantly how you manage memory in C. That's probably the biggest pitfall I see people coming from higher level programming trip up on. Study how objects work, different forms of math, etc. And that's all console code btw - don't move onto GUIs until your console knowledge is solid. GUIs are a whole different beast in C/C++ (and are a big reason why frameworks like Electron were built).

LLMs can also help you break into C development by a large degree. But they still get overwhelmed on a sufficiently large C codebase just like any other language. Your mileage may vary there.