theme?

Can I save custom fields of X plugin?
Can I save custom post meta of X plugin?
Can I save taxonomies of X plugin?
Can I save custom fields of X theme?
Can I save custom post meta of X theme?
Can I save taxonomies of X theme?

WP Content Crawler is able to save custom fields, i.e. custom post meta, and custom taxonomies of plugins and themes. How to save these is explained in Saving post meta (custom fields) and Saving taxonomy values guides. Note that WP Content Crawler saves these values in plain text format. Therefore, the plugin or theme using these values should store and read them in plain text format. If the values must be stored in another format such as JSON or serialized array, the plugin cannot save the values in these formats. It only saves them in plain text format. Also note that you need to know the keys of custom fields and custom taxonomies to save their values. How to find out these keys is explained in Post Meta Section and Taxonomies Section.

Certain themes and plugins might not be following the WordPress’ way when using custom fields and taxonomies and they might require additional things to save the values. For example, WooCommerce’s attributes cannot be saved directly as taxonomies. Therefore, WP Content Crawler has special built-in settings to save those attributes that can only be saved by using PHP codes. For this kind of special cases, the plugin’s built-in features for saving taxonomies and custom fields might not work. However, this type of cases is very rare.

If you also wonder if the plugin can get data from a certain site, you can refer to Can I get content from X site?.