Claim
Generic CTAs like 'Learn More' or 'Start Now' make users doubt because they don't know what happens next. A high-converting CTA solves a specific problem, uses customer language, and clearly defines the next step.
Mechanism
Specific CTAs reduce cognitive friction by making the outcome explicit, which lowers the user's uncertainty and increases their willingness to click. The promise of a clear, valuable next step (e.g., 'Test my English level for free') aligns with the user's goal and removes the mental cost of guessing what happens after the click.