This video 'instruction manual' for the BMPCC 4K is about as comprehensive as it gets. If you want know everything about the camera, grab yourself a drink of your choice and watch this.
The BMPCC 4K, despite being around three years old is still one of the most Googled cameras on the market. There is still quite a lot of demand for information on it, sometimes eclipsing the newer 6K and Pro models. Quite why that is we are not sure, however this video from Frame Voyager will tell you pretty much everything there is to know about it. The majority of information can also be applied to the newer models as well.
At 2hrs long you probably won't watch it in one sitting, but it's clear that a lot of work has gone into it. If you're sitting on the fence as to whether to get one and you want to know more about the practical and technical aspects of operating the BMPCC 4K, then this video should answer any questions you have. As a previous BMPCC 4K owner I even picked up a few things I didn't know before.