I've had a go at cooking a variety of dishes such as donburis, curry, sushi, nabe, ramen etc. I quite like this book - Recipes of Japanese Cooking - it is useful for living in Japan as it uses ingredients you can buy here, but it's also written in English as well as Japanese. Good for learning Japanese too as the English and Japanese are on the same page, cooking nouns and verbs.
Recently I've been learning more vegetarian dishes, more cook-at-home style dishes and bento recipes. Vegetables and tofu sides, with rice, miso etc. I own this book which has been useful (vegan, and only Japanese) - ますます菜菜ごはん