General colors are general color settings that used on all pages of the admin panel. You can use your main brand colors to make WordPress admin panel more like your own brand.
This is the main background color on all admin pages
Change the default dark gray color of the text in admin bar with this option
This will change the color of the footer text in WordPress admin panel
Change the color of all links inside the WordPress admin panel with this option
Similar to previous option, this option will change the color of all links in admin panel but on the mouse hover state
This option will change the color of the titles used in admin panel
This will change colors of buttons in admin panel
Changes the hover state color of all buttons in admin panel
Change the text color within the buttons in admin panel
Change the text color on button mouse hover state
You can use your branding color to apply it in multiple places in admin panel like tables, widgets etc. Please use very light version of your branding color (almost white), in order to respect the text contrast.