In what way does the three branches of the government help us?

It is debatable that three branches of Government actually DO matter.

They are: Federal, State, and Municiple.

There is political movement in some countries do "do away" with State Government, & expand local Council/Municiple Government to fill the vacancy.

ANS2:

The three branches of the US government are:

• Executive
• Judicial
• Legislative

Those three branches provide checks and balances, one against the others, to ensure that the government abides by the Constitution. Please read the link, below for the whole story.