You can make different types of changes to your WordPress site using WordPress customization page. Actually theme customization depends on the theme that you are using. You can customize WordPress title and tagline, front page of your site, background color, background picture and so forth.
Access WordPress Customization Page
Go to Appearance -> Themes page
Locate the active theme on this page and press the Customize button next to its title.
Then you will find a page to modify your WordPress theme in real time. Available options are positioned on the left of the screen and you will see a live preview of your site and those changes will affect it on the right side.
Modifying WordPress Title and Tagline
The theme customization page permits you to modify the title and tagline of your site. It also lets you to see how your customization will look on your actual site immediately. To do this, you have to expand the Site Title & Tagline group of settings and alter the text. While typing, new text will be appeared in the preview on your right side. Once you get your desired result, simply press the big Save & Publish button.
WordPress Front Page Customization
To customize your front page, you can choose between two options- either a static page or a list of the latest blog posts with part of their content. This is another setting which you can configure from theme customization page. You have to expand the Static Front Page tab to see the options available.
WordPress will show your latest posts on the front page by default. Yet, you can alter that option to A static page. Then two more options will be opened for you – one is to select a page to be displayed on your front page and other is that the page on which your blog posts should be shown. For both options you can choose from the list of all the pages that you’ve published. If the list is blank this means that you have not created a single Page.
Additional Theme Customizations
Depending on the theme that you’re already using there might be additional options such as allowance of modifying its site title and background colors, adding background image and more in that page. Once you get your desired result, simply press the Save & Publish button to save the changes.