Well, not very details tutorials, but I have documented some steps of the process in several posts. Genrally, exploring fractals is a learn-as-you-go thing for me, I experiment with different effects and settings and in this way I understand what works for my style and preferences. Here are some of the posts, from a quick search on my blog:
https://steemit.com/fractal/@nyarlathotep/fractalizing-with-jwildfire
https://steemit.com/fractal/@nyarlathotep/cosmic-checkers-with-detailed-process
https://steemit.com/art/@nyarlathotep/flower-tentacles-a-fractal-with-bits-of-the-process
https://steemit.com/fractal/@nyarlathotep/bloody-fractals-from-outer-space