• Use SEO-friendly URL extensions.
• Perfectly optimized title: keep it under 55 characters, mention target keyword in the title and wrap your title in H1 tags.
• Use visual media
• Link to authority websites.
• Drop keyword in first 100 characters.
• Use related keywords.
• Optimize image file name and ALT tags.
• Improve loading speed: for example compressing image file size.
• Optimize your page for social sharing
• Have a high word count for content: pages ranked 1 on Google have a word count above 2.000 words.
• Use responsive code to adapt to different mobile devices.

For more information about each item, check the image below.

From http://www.quicksprout.com

For more information about the 200 items Google checks for ranking a page, click here