Add the ability of changing background color of a theme [closed]

You can start off by studying about Theme_Customization_API here.

For your specific problem follow this link.

Related Posts:

  1. Menu items description? Custom Walker for wp_nav_menu()
  2. How to define and link full path to css located at a random folder on header.php
  3. Sizing screenshot.png without losing aspect ratio
  4. Software for WordPress Theme and Plugin Development? [closed]
  5. When to use is_home() vs is_front_page()?
  6. What is the preferred way to add custom javascript files to the site?
  7. Get the blog page URL set in Options
  8. How to create .pot files with POedit?
  9. How do I get the theme URL in PHP?
  10. Why when I submit a form in wordpress it loads a 404 page though URL is correct
  11. What is the constant WP_USE_THEMES for?
  12. Worthwhile to restrict direct access of theme files?
  13. How Do I Protect My Premium WordPress App Theme from Copying?
  14. How to detect mobile devices and present them a specific theme?
  15. Using wp_add_inline_style without a stylesheet
  16. How to add posts to custom menus?
  17. WordPress Theme Preview Image
  18. How To extend WP_Customize_Control
  19. What is the difference between front-page.php and home.php? [duplicate]
  20. How can I get page slug
  21. Does the functions.php file ever get called during an AJAX call? Debug AJAX
  22. When to use _e and __ for the translation?
  23. What is a Theme textdomain?
  24. How to show a custom meta box on the “Quick Edit” screen?
  25. How to add CSS class to custom logo?
  26. How to add custom css file in theme?
  27. How important is it to enqueue a theme’s stylesheet?
  28. CSS not updating in browser when I change it
  29. Display Search Result Count
  30. wp_nav_menu(), how to change class?
  31. theme path in javascript file
  32. Is wp_is_mobile() effective?
  33. Display Menu Name using wp_nav_menu
  34. Making update notification functionality for my themes
  35. What questions do you ask when asked to give an estimate on theme development?
  36. How to remove dashicons.min.css from frontend?
  37. How do I remove a pre-existing customizer setting?
  38. Minimum Template Files for Theme Development
  39. What’s the difference between home.php and index.php?
  40. pass object/JSON to wp_localize_script
  41. get_template_part vs action hooks in themes
  42. Theme Activate Hook
  43. Solutions for generating dynamic javascript / CSS
  44. wp_redirect() – headers already sent
  45. Can I create my own “Recent Posts” widget or customize the existing one?
  46. Custom single template for a specific category
  47. how can I add an icon/image for a child theme?
  48. How can I add a URL field to the attachments window?
  49. The the_post_thumbnail without srcset?
  50. The proper way to include/require PHP files in WordPress
  51. Get the first image from post content (eg.: hotlinked images)
  52. after_setup_theme always runs
  53. When to use add_action(‘init’) vs add_action(‘wp_enqueue_scripts’)
  54. Getting failure when using filemtime() with wp_enqueue_style
  55. Do I actually need to link my theme’s style.css in the theme files
  56. Why is wp_head() creating a top margin at the top of my theme header?
  57. How to store widget fields data as an array?
  58. How do I add version control to my workflow?
  59. Using classes instead of global functions in functions.php
  60. WordPress API Menu/Submenu Order
  61. How can I display a menu on certain pages only?
  62. Enqueue a stylesheet for login page and make it appear in head element
  63. Adding a div to wrap widget content after the widget title
  64. How to insert a logo in the header?
  65. How to set permalink structure via functions.php
  66. What is $post_id? is it a global variable in WordPress?
  67. How to override pluggable function in theme?
  68. How to move page template files like page-{slug}.php to a sub-directory?
  69. WooCommerce shop page to use my custom template [closed]
  70. Theme customizer – settings order
  71. What is the difference between wp_register_sidebar_widget and register_widget?
  72. Should we use get_template_part() in functions files instead of include_once?
  73. Reset positions of metaboxes in admin
  74. CSS classes for theme
  75. “Quick Edit” > update clears out my custom meta values
  76. How to enqueue script if widget is displayed on page?
  77. Custom Image section in Customizer
  78. A way to automatically install pages on theme install?
  79. Get entered value of customiser field for live preview
  80. Add custom classes to anchor in wp_nav_menu
  81. How to remove search bar from a wordpress theme? [closed]
  82. Upgrade from 5.0.4 to 5.1.1 causes $theme to be null
  83. Bestway To Define Theme and Plugin path and url
  84. Is there a has_more_tag() method or equivalent?
  85. With WordPress themes, where do I store the images and files relatively?
  86. Form to Add Posts to Custom Post Type
  87. What are the advantages and disadvantages of Option Tree over the Customization API?
  88. Should `get_template_directory_uri()` be escaped?
  89. How do I add settings to the Background Options Page?
  90. Can a theme be built in React?
  91. Best practices for monitoring the need for future updates on a theme that I developed?
  92. Get url of thumbnail from the media uploader
  93. Are content.php and content-single.php the same?
  94. My child theme doesn’t work Error: “The parent theme is missing. Please install your parent theme”
  95. Import media to online WordPress from local development
  96. How to add a checkbox element to attachments editor with example
  97. Generating CSS Files Dynamically Using PHP Scripts?
  98. Auto get_header and get_footer on every template?
  99. Customize WordPress>Error Page
  100. Add Caret to Menu Items with Sub-Menus in WordPress Theme
Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)