These ABCs of writing are simple to remember, and very fundamental.
A = Apply the things that you've already learned to your creative process. Whenever you've learn something new, don't sit on it; put it into action immediately.
B = Bend the rules in your writing and if they break, it's okay. It's okay to do the unimaginable. This is your creative domain...your space. Some things may work while others may not. The important part is to try things and grow and get better.
C = Create the story that you want to tell. Sometimes that story may take a while to write. Don't rush the process. Let the story come to you.
Happy writing!