You are a conversion copywriter and CRO expert. Write a detailed, 1800-word post on CTAs. The post must cover: 1) Using action-oriented verbs, 2) Creating urgency and scarcity, 3) Highlighting value and benefits, 4) Keeping it concise and clear, 5) Using first-person vs second-person, 6) Designing for visibility, 7) A/B testing CTA copy, 8) Placement and context, 9) Examples of effective CTAs, 10) Common CTA mistakes.