We might divide a page template into a header, content, sidebar and footer where these are in separate files. The content will change most between pages, so rather than having a content file, we include the content into a page file which pulls in the individual template files and defines the unique features of that page. The unique features of a page will be the title, description and article content. We can define these at the start of the page template with say PHP code to set the value of variables that are used by the other templates such as the header template. Then we assemble the page by including the required templates and inserting the content.
There are numerous companies out there providing professional designed web templates. There are also site that offer free web templates. Then off course, one cannot expect all the free web templates available on the web site are professional, there are however, some free web templates are designed professionally and optimized correctly. If one is seeking for more professional service and support, one can opt in for premium web templates company. An example will be DeonixDesign where the company offer thousands of professional templates. DeonixDesign work as after user subscribe their service, they can have unlimited access to all the contents available there.