Some translations set poetry farther to the right than the rest of the text to show that it is poetry. The ULB does this with the poetry in this chapter.
The prophecies of this chapter occur after the exile in Babylon and are not in reference to the people contemporary to Isaiah. (See: [[rc://en/tw/dict/bible/kt/prophet]])
There is an important teaching or prophecy about the Messiah beginning in this chapter and continues through the next chapter. This prophesy begins in 52:13 and scholars usually note that it portrays the Messiah as a "suffering servant." (See: [[rc://en/tw/dict/bible/kt/christ]])