Uhh could someone help me?

“there are forms of oppression and domination which become invisible – the new normal.” - michel foucault meaning?

The great depression, which lasted throughout the 1930s in the united states, affected many people, and it had a devastating impact on an entire subset of the u.s. population. modernist writer john steinbeck wrote about the toll the depression took on these families, many of whom were forced to leave their farms and find other sources of income.

What do advice means in the dictionary?