Hello Kemmy,
Thank you for contacting us about whether you need a child theme to use BoldGrid. A child theme is not required to build and customize your site with BoldGrid. But, if you have knowledge of PHP, HTML, and CSS, a child theme can be used to do things like customize your page, header and footer templates, add additional widget areas or sidebars, and much more. Here is a link to our guide on How to Create a Child Theme to Customize Your WordPress Website.
Thank you,
John-Paul