Be it signing up for a service, downloading a free product or purchasing a product if the Call-to-action is unclear when a user lands on a page, he will leave your site immediately.
Since the main purpose of a call-to-action is to guide visitors to take immediate action, having an unclear call-to-action or having too many different CTAs on a landing page is likely to drive potential customers away. Thus, while crafting a Call-to-action ensures that is it clear and concise.
1. Determine what you want your reader/visitor/potential customer to do ahead of time
2. Be clear and concise
3. Be repetitive if necessary
4. Tell them how
5. Eliminate competing calls to action
6. Remember that you will have numerous calls to action so think about each one individually