What book should I start with when studying Zhouyi? Please give some advice and look at Zhouyi with a learning attitude.

There is a series of books, which seem to be called Zhouyi Annotations or something. That's good.

In fact, you can look for it casually. The main content is to write easily. Give you a detailed analysis of what each hexagram means and what it represents. Do it.

In addition, the video of Fu Peirong's interpretation of sixty-four hexagrams is also good. More than 60 episodes. You can have a look, very serious and good!