The Self Publishing Formula (created by successful indie thriller author, Mark Dawson) is a great resource. The site offers free training and ebooks, plus a useful weekly podcast.
They also offer paid courses, which are exceptional value.
Mal Cooper and Jill Cooper
Kristine Kathryn Rusch
Dean Wesley Smith
(This is a great explanation of copyright and intellectual property for authors, which really helped me to begin valuing my own work)
These are some of the tools that I use. I’m sure there are many similar tools out there!
Free online design tool, great for social media posts.
Easily create 3D and eReader book images.
Color Picker extension for Chrome
Pick colours from a website image, and get the hexadecimal code, or RGB value. Great for picking colours from a book cover!
HEX code picker
Once you have the hex code for a colour, this tool shows you up to 3 complementary colours.
The site has loads of useful free content and Joanna Penn’s wonderful weekly podcast.
David Gaughran has several books on publishing and marketing, but also provides lots of useful free content on his website. It’s also worth signing up to his excellent mailing list for excellent advice/videos/commentary.