How checks and balances work within legal system?

In the U.S. federal government there are three branches of government--the legislative, the executive and the judicial.

Supposedly the legislative branch makes the laws and through this method potentially can override the judicial branch and the executive branch by passing or dismantling laws.

The executive branch enforces the laws and can override the other two branches by choosing which laws to enforce.

The judicial branch can override the other two branches by declaring laws and executive orders unconstitutional or in how laws are interpreted.