If you do much with WordPress, you will find the need to create page templates at some point. Page templates are theme files that produce the layouts for pages, posts, custom post types, category pages, and more. In this context, “page” means more that just a page: it means a file template that helps to show content in a theme.
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One other lesson to learn about using WordPress themes is the concept of child theme. A child theme is a copy of another theme – what we will refer to as the parent theme – and the child theme runs under and requires the parent theme.
Once in a while, you will run into what can be a common problem with WordPress. You make some changes to the site, add a new plugin or do something else, and suddenly, all you see a blank white screen instead of your website. The browser screen is white, except for an error that reads something like this: