Call to Action better known as CTA appeal website user to take some specific action. You can use this CTA button wherever you want the user to do respond or do something.
1) Correct placing
Most of the Web developer’s does mistakes by giving single CTA on a page. It’s very true that more CTA’s on a page, more chances the user gets covert any time. However, giving too many CTA’s on a single page will confuse the customer causing no action taken at all.
2) Design
It’s been always recommended to design a CTA button more prominently with an appealing design. The color combination should be contrasted and vibrant such that it should call out customers to take the action immediately.
3) Text
The text should be so compelled and straight that customers should get an exact idea of what the next action is to happen. Always be clear and direct! Also, the content on CTA should be relevant to the action viewer going to be taken.