What's the difference between a hillbilly, a redneck and a good ol' boy?

Hi. I am doing research on American rural subcultures. I know what a hillbilly is:

From https://en.wikipedia.org/wiki/Hillbilly:

" 'Hillbilly' is a term (often derogatory) for people who dwell in rural,
mountainous areas in the United States, primarily in southern
Appalachia and the Ozarks. The term was later used to refer to people
from other rural and mountainous areas west of the Mississippi river too,
particularly those of the Rocky Mountains and near the Rio Grande."

I know what a redneck is:

From https://en.wikipedia.org/wiki/Redneck :

"Redneck is a derogatory term chiefly, but not exclusively, applied to
white Americans perceived to be crass and unsophisticated, closely
associated with rural whites of the Southern United States. Its
usage is similar in meaning to cracker (especially regarding Texas,
Georgia, and Florida), hillbilly (especially regarding Appalachia and the
Ozarks), and white trash (but without the last term's suggestions of
immorality). In Britain the Cambridge Dictionary definition
states: 'a poor, white person without education, esp. one living in the
countryside in the southern US, who is believed to have prejudiced ideas
and beliefs. This word is usually considered offensive.' People from
the white South sometimes jocularly call themselves 'rednecks' as
insider humor.

By the 1970s, the term had become offensive slang, its meaning expanded
to include racism, loutishness, and opposition to modern ways."

But how is a hillbilly and a redneck different from a good ol' boy?

From https://en.wikipedia.org/wiki/Old_boy_network:

"Mostly in the Southern United States, the term good ol' boy has a slightly
different, often derogatory meaning—a friendly, unambitious, relatively
uneducated white man who embodies the stereotype of the folksy culture
of the South. A good old boys network has the connotation of this sort of
personality combined with cronyism.

This southern term also refers to the personal and friendly relationship
between common citizens and local authorities usually resulting in
lenient or sometimes no punishments for crimes committed by friends of
law enforcement."

Please help. Thank you.

I was told hillbillies marry rednecks.

If I may ask are you from rural America?

A 1783 pejorative use of crackers specified men who "descended from convicts that were transported from Great Britain to Virginia at different times, and inherit so much profligacy from their ancestors, that they are the most abandoned set of men on earth". Benjamin Franklin, in his memoirs (1790), referred to "a race of runnagates and crackers, equally wild and savage as the Indians" who inhabit the "desert[ed] woods and mountains".

Yes.

From https://en.wikipedia.org/wiki/Peckerwood :

"Peckerwood is a term used in the Southern United States for a woodpecker which is also used as an offensive epithet toward white people, especially poor rural whites. Originally an ethnic slur, the term has been embraced by a subculture related to prison gangs and outlaw motorcycle clubs. The term was in use as an inversion of woodpecker by the 1830s, with the sense referring to white people documented from the 1850s. African-American folklore in the 1920s contrasted the white 'peckerwood' bird with the African-American blackbird. The word became a common term in Jive."

For a long time I thought "peckerwood" was a vulgar sexual term. I heard the term used as a kid. I guess I was wrong.

If it means "woodpecker" I guess I can use it.