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Usually, WordPress Themes have category list in their PHP code. Actually you can put your own category list on your sidebar widget or in anywhere in your theme using PHP implementation.

To put wordpress category list, you have to put PHP snippets like

<?php wp_list_categories($args);?>

You can left the $args blank for default settings but if you want a modification, the list of arguments is below:

1. ’show_option_all’ (string) – Text to display for showing all categories.
2. ‘orderby’ (string) default is ‘ID’ – What column to use for ordering the categories.
3. ‘order’ (string) default is ‘ASC’ – What direction to order categories.
4. ’show_last_update’ (bool|int) default is 0
5. ’show_count’ (bool|int) default is 0 – Whether to show how many posts are in the category.
6. ‘hide_empty’ (bool|int) default is 1 – Whether to hide categories that don’t have any posts attached to them.
7. use_desc_for_title’ (bool|int) default is 1 – Whether to use the description instead of the category title.
8. feed’
9. ‘feed_type’
10. ‘feed_image’
11. ‘child_of’ (int) default is 0
12. ‘exclude’ (string)
13. ‘exclude_tree’ (string)
14. ‘echo’ (bool|int) default is 1 – Whether to display or retrieve content.
15. ‘current_category’ (int)
16. ‘hierarchical’ (bool)
17. ‘title_li’ (string)
18. ‘depth’ (int) – The max depth.

For example you may see cases below:

1. Show Only Parent Categories

   <?php wp_list_categories("depth=1");?>

2. Show Categories Order by Name and Only Parent Categories

   <?php wp_list_categories("depth=1&orderby=name");?>

3. Show Categories Order by Quantity

   <?php wp_list_categories("orderby=count");?>

4. Show Categories Only The Parent and Second Branch

   <?php wp_list_categories("depth=2");?>

5. Show Category List Including Categories which are empty

   <?php wp_list_categories("hide_empty=1");?>