Script Format

Can you tell the difference between a spec script and a shooting script? Well I couldn't until I went to this website. It is full of script terms, tips, and many examples. Here is a helpful tip from the website on writing a screenplay: "Write Only What Can be Seen and Heard - Unlike a novel, everything in a screenplay must be recorded in terms of picture and sound. Therefore, narrative description should never include anything that cannot be seen or heard. "