Step-by-step explanation:
there were several, actually.
the states shoulld focus on unity. secession should never be an option. the US's strength is in a united front towards the rest of the world.
citizens should count themselves as Americans above all else. above ethnicities, religious sects, inhabitants of different states, while persons can be labeled as any of these things, citizens must place, being an American above all of those constucts.
all changes in our governing as a republic must be accomplished constitutionally. we are a nation of laws and by rule of law.
as citizens, we have the rights to alter our government and constitution, government is to be run by the people for the people through amendments, prudently. government must be minimal to ensure freedom of people's lives and livelihoods.
Washington warned against political parties/factions.
his most important admonishment was perhaps, staying out of other country's political business. the United States should not become involved with other nations, stay away from alliances, these lead to foriegn unnecessary wars.
you should probably read it on your own, it is eerily prescient for current events.
unfortunately, we don't learn much from history, we just keep repeating it.