The correct answer to this open question is the following.
The three central ideas expressed by Thoreau in this essay, "Where I Lived, and What I Lived For," are the following.
The idea of having an ideal life. The idea of self-reliance. The idea of having your bare necessities covered such as food, housing, and clothing.
Henry David Thoreau is the author of "Where I Lived, and What I Lived For,"
Thoreau (1817-1862) was an author and a naturalist that had different ideas compared to the ones expressed in his time by other authors, In his book "Walden" he refers to the importance of having a simple life with the basic necessities covered, living in a nice place, surrounded by nature and family members.
He also had a rebellious side that is portrayed in the essay "Civil Disobedience," written in 1849.