Themes play a very important part in learning how to use WordPress as they control the appearance and feel of the public-facing side of the website. Getting to know a theme is critical for new users as it will be where they will likely need to place their logos and select configurations to work towards making each one uniquely theirs.
If you have ever tried to load a website on a mobile device with very large “high-res” images, you have probably noticed a lag in how long it took to load the page. To save bandwidth and combat long loading times, web browsers are starting to provide special tools that allow website developers specify which image to load based on the type and size of the screen.
Using your images on your WordPress blog can be a great tool to help convey a message and enhance overall reader experience of your site. But images can actually hurt your site if they’re not optimized for the web, degrading the quality of your site leading to penalties from search engines.