Each platform has specific optimal dimensions: Instagram feed posts work best at 1080x1350px (4:5 portrait, which takes up more scroll space than square), Instagram/Facebook Stories at 1080x1920px (9:16), and Facebook/LinkedIn feed images around 1200x630px -- designing at the wrong ratio causes awkward automatic cropping that can cut off faces or text. Because most social media is viewed on phones, text must be large enough to read on a small screen (a safe minimum is around 24-30pt for key headlines) and important content should stay within the 'safe zone' away from edges, since platform UI elements like profile icons and captions often overlap the top and bottom of Stories. Tools like Canva and Adobe Express provide pre-sized templates and reusable 'brand kits' (saved logos, colors, and fonts) that let a designer produce a week's worth of on-brand content in under an hour instead of starting from scratch each time. Consistency across posts -- same color palette, same font pairing, same logo placement -- is what makes a business's social feed look professional and recognizable even before a viewer reads the caption.