This widget allows you to easily create a specific category list. You can exclude any categories you please.
The “widgets” admin page is found in the administrator part (wp-admin) of your WordPress site. Go to Appearance > Widgets
First go to your Posts > Categories in the administrator part (wp-admin) of your WordPress site. Click the category you desire to find its ID. Its ID number should then be displayed in the URL section of your browser. (It should say $tag_ID= followed by your category ID number.