One of the things I found out that can be difficult is to manipulate that font I am using because for longer site titles, it can look bad with big spacing between multiple lines if the title wraps down. The best way is to do one of the following:
1. Changing the font
2. Changing the font size
3. Changing the font size and font
4. Switch to a logo image for the site title and tagline which will be responsive and resize based on viewing device
To change the colours of the Site title and tagline, I just looked and realized how can I forget to add those colour options into the theme. I made a note of this to do an update. But in the mean time, the styling (colours) are found in the theme’s style.css around line 378 and looks like this:
By the way, as you can tell from the code above, you can change the font and size too. I use em units for size but you can change it to px if you wish. To convert px to em or em to px, I use this: http://www.pxtoem.com
To update the theme, you would download the theme just as you did when you first got the theme. Hopefully you still have that download link. If you purchased or upgraded to the Theme Membership, you can simply log into this site and on the top menu click on Downloads.
If you never use the parent theme, that is ok if you want to use the child theme. That way any modifications you make to the theme files, you won’t lose them whenever there’s an update.