How do I improve my Google quality score?

There are numerous factors which combine together to affect the quality score of your Landing Page. Some of the major factors are mentioned below:

• The relevance of keywords to your ad group
• Click-Through Rate (CTR), optimum should be between 1-5%
• The quality of your landing page like responsive, page load time and other On-Page SEO factors
• The relevance of the text in your ad
• User experience, how the flow is maintained between sections of a page
• Your historical performance in AdWords