The OceanWP theme is very popular. The theme itself is free and can be found in the WordPress directory.  It has more than 400,000 active installs and more than 2,440 5 star reviews. This free theme has a very large number of customization options, the most of any free theme.  The free theme comes with a number of extensions.  There is also a premium version that includes premium extensions and professional support from the OceanWP team.  

Check out the full review and video to learn more about OceanWP