Is it the right way to add jquery and css in wordpress?

No. As wordpress codex states, you should use jquery and other javascript files provided by them. As for css files I think you can use yours.

Please check this link( scroll down) for a list of already defined javascript files.

Also, you have to use local files as much as possible, unless you have no other way. So for example, if you have a js library, you should download it and include it in your theme/plugin files and not enqueue it using CDN or any other external link. WordPress team will refuse to publish your theme/plugin if you include external js files without a good reason.

LE: for jquery-ui you only have to use this 

 wp_enqueue_script( 'jquery-ui')

or add it as a dependency of your own script like this

wp_enqueue_script('my-script', 'url-to-scrip', array('jquery-ui'))

Related Posts:

  1. What’s the difference between term_id and term_taxonomy_id
  2. How are bulk actions handled in custom list table classes?
  3. How do I programatically insert a new menu item?
  4. When would I use either function for plugins?
  5. Creating Settings Page with dropdowns for Plugin
  6. Test to see if jQuery or Prototype is queued by another plugin?
  7. Empty POST data on server on AJAX request using Angular $http
  8. Custom Nav Menu items default to ‘menu-item-type’ => ‘custom’. How to make a “page” menu item?
  9. How to tell if an option has been created vs an empty option?
  10. jQuery in header or footer
  11. Notice: _usort_terms_by_ID is deprecated since version 4.7.0! Use wp_list_sort instead
  12. How to add a new plugin page under desired Options page?
  13. Plugin screenshots not showing in the repository
  14. How to make WordPress use non-greedy shortcode parsing?
  15. Multiple Parameters for a Shortcode
  16. Implementing namespaces in plugin template
  17. How to get current page name in my wordpress plugin
  18. WP Cron doesn’t save or in post body
  19. Use register_taxonomy() in register_activation_hook()
  20. Pages 404 in wordpress
  21. How to properly load text domain of custom mu plugin
  22. Post from front-end with post types, categories and taxonomies
  23. Calling apply_filters on non-documented hooks
  24. Multiple entries in get_option results? or why is _multiwidget set to 1?
  25. Check if I am in the Admin Panel (wp-admin)?
  26. Fully automated theme install and activation via a plugin
  27. Commit changes to WordPress Plugin SVN with TortoiseSVN
  28. Why is WP_Mock not used instead of WP_UnitTestCase for writing unit tests by most plugins?
  29. add_shortcode is not working [duplicate]
  30. Metabox Not Showing on Custom Post Type But On Pages and Post
  31. Using Checkboxes on Plugin Options Page for Custom Plugin
  32. Create a Page via plugin
  33. Generating User(s) with Settings API
  34. Processing shortcodes in groups (separated by line breaks)?
  35. How to get the post content after WordPress post processing?
  36. Including a JS source with an admin page
  37. Should action callbacks start with a verb?
  38. How insert negative values in Gutenberg box-control
  39. What filter should I use to insert a button inside on Media>Add New
  40. Global State During an Admin Post
  41. How to use a hook to override an update_post_meta call in a plugin?
  42. External Authentication, session_tokens not destroyed on logout
  43. Display custom fields in frontside user profile
  44. Strange issue saving custom field data for a WooCommerce order
  45. How to programmatically add a custom template that appears in Site Editor from a plugin?
  46. In woocommerce cart item we can add custom text but how can i add custom link? [closed]
  47. Is it possible to restrict all admin pages except theme customisation and storefront using plugin?
  48. Build a translation correcter plugin
  49. Secure REST with nonce works only when not logged
  50. Selectively update themes in WordPress multisite
  51. template_include filter does not render the custom template
  52. How to set a cookie for logged in users to md5($user->ID . “my_secret”)?
  53. jQuery instantly executes (a button click and css change) on load
  54. WordPress plugin enqueue scripts working for js, but not css files
  55. Bind a function with its own argument to show something dynamically after every content
  56. Inserted double quote when prepending to the_content
  57. unable to wp_enqueue_script(‘suggest’);
  58. Plugin development – loading Javascript and Flash
  59. Drawing the line between theme & plugin on large scale bespoke projects
  60. HowTo to add my rewrite rules at the beginning, redirect to the right page and flush the rules on plugin activation?
  61. Apply styles to blockquote element with the WYSIWYG editor
  62. Update variable value via add_filter
  63. Do I need to create an endpoint?
  64. Run uninstall.php if a checkbox is checked from settings page
  65. How to check whether checkbox is checked in WordPress customizer
  66. Gravity Forms Anchor only on Front Page?
  67. How to find list of all functions bind to a particular hook from my plugin?
  68. Multiple page plugin settings
  69. how to get the top 10 popular blogs
  70. How to output CSS to the beginning of the stylesheet in a WordPress Plugin
  71. Set page to draft on plugin deactivation
  72. Can one plugin activate another plugin via script?
  73. script seem not load with use wp_enqueue_script
  74. Insert and read media from the WordPress library and call in the plugin
  75. Do I lose translations when I change my Text domain for my plugin on wp.org?
  76. Override woocommerce loop-start.php from theme using plugin?
  77. Get value of custom checkbox from Gutenberg sidebar in plugin
  78. Enable a role named ‘backend_user’ to access my plugin pages
  79. jQuery dependent script ignores $in_footer bool and doesn’t work in header
  80. Hiding class namespace from plugin’s extensions
  81. How to trigger WooCommerce user profile edit change?
  82. Relational / Associate tables using native WordPress functionality
  83. Stop unauthorised file access
  84. Changed media upload path for plugin, but generates error & shows wrong url
  85. How to pass a more variable with page/subpage in Wordprees URL?
  86. Pull commentdata for pre_comment_on_post from comment_post_ID
  87. Dynamic sidebar areas not working on the Theme Customizer
  88. Woo-commerce: Adding additional page sections using a child theme
  89. Plugin dev: How to multiply instances of a plugin in the same metabox?
  90. Merge Codes using redux framework
  91. How to get html tag ids from template?
  92. Getting Plugin to read all script files
  93. PHP Fatal error when using plugin_basename
  94. How to Rewrite WordPress URL for a Plugin
  95. How to Prove Ownership of plugin [closed]
  96. Reading the inside of
  97. WordPress, GIT, Renamed Plugin Dir + files – Working Code now Broken [closed]
  98. get_term_by() returning null on plugin
  99. Advanced Custom Fields conflicting with custom plugin when saving custom field
  100. WordPress plugin boilerplate AJAX functionality