Taxonomies (category, tag) (category)

category_description()

Gets the description of the category, which is specified on the category editing page in the admin panel (posts > categories).

get_the_term_list()

Displays a list of links to taxonomy elements (e.g. tags) related to a specified post.

in_category()

Checks whether the current (or specified) post belongs to the specified category (multiple categories can be specified). Conditional tag.

single_cat_title()

Displays the title of the category or tag. Used outside the loop. Intended for archive pages.

single_tag_title()

Outputs the title of the current meta-field if the tag archive page is being viewed.

single_term_title()

Display or retrieve title for the current taxonomy (category, tag, etc.). Uses on term archive pages.

tag_description()

Gets the description of the tag, which is set when creating/editing the tag in the admin panel.

term_description()

Gets the description of the term (taxonomy element: tags, categories, etc.) that is specified on the term creation/editing page.

the_taxonomies()

Display links to taxonomy terms of the current post. Used inside WordPress loop

the_terms()

Outputs a list of links to terms (taxonomy elements) related to the specified post.

wp_dropdown_categories()

Display or retrieve the HTML dropdown list of categories. Instead of categories you can specify the name of an custom taxonomy.

wp_generate_tag_cloud()

Processes the provided term (tag) data and returns the HTML code for the tag cloud.

wp_list_categories()

Displays a list of categories as HTML links. If you click on the link, all posts from the category will be shown.

wp_tag_cloud()

Outputs or retrieves a tag cloud (a list of tags in the form of a cloud). You can specify any taxonomy.