Here are two excellet web sites which I have found extremely useful. Both are maintained by video and film professionals.
Walter Graff's site -- www.bluesky-web.com -- has a wealth of information in the section called "Purchase/Learn." Not sure why the Purchase part is in the title as there is nothing there to buy on the entire site. Here you learn a great deal about lighting and other aspects of production.
Ron Dexter's www.rondexter.com contains short articles based on Ron's experience of decades in the business. It's folksy, funky and very informative.