how to understand some English sentences in the cook book？

I am so sorry abou these easy question. This approve I am so weak in English skill.

Please give me some instruction, thanks a lot.

1.The first sentence as below:

"New in version 2.1. Blocks replace the deprecated $scripts_for_layout layout variable. Instead you

should use blocks. The HtmlHelper ties into view blocks, and its script(), css(), and meta()

methods each update a block with the same name when used with the inline = false option"   

(page 80 in the cook book 2.0)

What does the mean of the Red part?

2.The HtmlHelper also allows you to control which block the scripts and CSS go to

(page 80 in the cook book 2.0) 

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