https://visualeducation.com/class/creating-clean-white-backgrounds/

• Discover Karl’s foolproof system for getting white right.How to achieve clean white backgrounds: it’s a question every photographer needs to ask. This class has all the answers.
• The crisp white backgrounds you see in professional images seem simple enough to create. After all, it’s just white, right?
• Wrong! Achieving the perfect white background is harder than you think. There are very specific lighting techniques you need to master in order to get those results. Without them, you’ll end up ruining your shots with flare or overexposure.
• In this easy-to-follow, step-by-step class, you’ll discover those essential techniques, plus the equipment you need to achieve a clean white background. You’ll also learn how to tell whether the background is overexposed using RGB values.
• By the end, you’ll feel fully confident in your ability to get white right every time!