Most designs use two fonts: one for headings and one for body text. Here are the rules that guarantee a good pairing.
Rule 1: Contrast
Fonts should be different enough to establish a clear hierarchy. The classic pairing is Serif + Sans-Serif. For example, Playfair Display for headings and Inter for body text. Avoid pairing two fonts that look almost identical (like two different geometric sans-serifs) — the eye cannot tell them apart, and the design feels muddy.
Rule 2: Hierarchy
The heading font should be visually louder than the body font. You can achieve this through size, weight, or color. A bold, condensed font for the heading paired with a light, readable font for the body creates a strong visual hierarchy.
Rule 3: Mood
Both fonts should serve the same purpose. Do not pair a playful, cartoonish font with a formal, traditional font. If the heading feels like a tech startup, the body should not feel like a 19th-century newspaper.