Bizlight – Control colour of headers and links

Hi everyone,

I know nothing about function and, am therefore stuck with my new site.
We are using Bizlight Theme and have created a child theme mainly to control the colour of links depending on where they are on the site i.e breadcrumb, paragraph… and the different headers.

My understanding is these colours are controlled by the following function:

[ Unreadable code block redacted ]

which is located in this folder wp-content/themes/bizlight/inc/customizer/colors
the file is named general.php

How can I overwrite this function and take full control of the links and header colours?

I’ve tried to find a solution and understand other examples but like I said functions are not my thing at all.