Explore the nuanced differences between Opacity and Fill in Photoshop through this comprehensive tutorial. Discover how these features behave differently in special blend modes and with layer styles, and learn practical applications for color grading, creating special effects, and enhancing your digital artwork. Master the concept of Blend If, understand gradient fills, and learn to create realistic elements like a fake sun with glare. Gain valuable insights into various applications of these techniques and conclude with a quick recap to solidify your understanding of these essential Photoshop tools.