The document discusses principles of web design including balance, contrast, emphasis, proximity, repeat or rhythm, white space, and line. It states that balance can be achieved through symmetrical or asymmetrical layouts and is important for guiding users through a page. Elements can be balanced, unbalanced but follow patterns, or deliberately out of balance for visual impact. Contrast uses different colors or tones and emphasis draws attention. Proximity groups related items and white space contributes to balance while lines can highlight content.