Re: White belt to 6th kyu (yellow belt)
I second what Krystal said about the training journal. It's useful to review, but more useful, I think, for internal processing and development in things that are not that obvious. Journaling has benefits beyond the obvious that are hard to understand until you do it for a bit. One suggestion: if you do this, try not to write for an audience -- it will be hard at first, particularly if you do a lot of that kind of writing, but a journal is the best opportunity to find your authentic voice.