There are lots of video production resources on the web, but this one's aimed at filling a gap in the conversation between two groups of people.
First is producers and directors who hire freelance shooters. When I was a producer, I hired dozens and dozens of freelance shooters. It can be daunting because the wrong person or a technical oversight can sink your entire project. So this blog gives some insights from working on both sides of that relationship. You'll also find notes on equipment focused on what you need to know so you can speak to your DP in his native tongue.
It's also for freelance shooters. How to work best with your producer or director is one of the most important parts of the job. You might work for four different clients in a week, each with completely different needs, budget and expectations. Understanding where they're coming from will make you a much better shooter. You'll also find posts here on gear that's useful specifically to freelancers. Things that'll help you work quickly and be prepared for any situation, which ultimately makes your shooting way, way better.