Some translations set each line of poetry farther to the right than the rest of the text to make it easier to read. The ULB does this with the poetry in 2:1-31.
The prophecy revealed to Jeremiah is recorded in 2:1-3:5. Despite covering more than one chapter, this should be seen as one unit. (See: [[rc://en/tw/dict/bible/kt/prophet]] and [[rc://en/tw/dict/bible/kt/reveal]])
The people worshiped other gods, particularly the fertility gods of Baal and Ashtoreth. Even when the nation was punished, the people did not learn. (See: [[rc://en/tw/dict/bible/kt/falsegod]])