AI is displayed on one side, that is to say, if you want to make a color page, it is best to have a single page with a file on the front and a file on the back. It's ok in the same file, but it's more troublesome to modify it later.

First, the color mode, because AI is taken directly from the film, so the color should be CMYK, otherwise the color will definitely make mistakes in post-production, and even there may be problems when it is printed in black.

Second, line, AI is a vector line, which can be zoomed in and out at will, but be careful, the path is thin and will not change. For example, if you don't have a thumbnail, and then you zoom in, the path is set to 0.25PT, and the zoom in the back is still 0.25PT, so after you finish, if you want to zoom in, you must first expand the path into a face, so that it won't affect the zoom in, but you can't modify the path.

There are still many details that you need to master in practice, and you can also learn from your brothers and sisters so that you can really understand them in practice.