I absolutely recommend this. It teaches you 3 different sizes of chibi bodies. It starts with how to hold your pen and draw strokes, the difference in chibi types, to knowing the measurements of making an appealing chibi character. The book covers clothing, eyes, hair, head, arms, legs, expressions, etc. There are tons of poses and even line-by-line tutorials.

You also don't need to know Japanese to understand. The book is as thick as a regular manga volume and about as big as writing paper, so there is a lot of value!