Legal Question in Employment Law in California

The employer is entitled to set and change hours, duties, titles, compensation, benefits, leaves, vacations, holidays, etc. Employees have the 'right' to pay and employee benefits per the law and company policy as agreed, provided a 'safe' workplace to minimize risk of injury, and sometimes are provided certain medical/pregnancy leave rights. That's about it. In general, unless an employee is civil service, in a union, or has a written employment contract, they are an 'at will' employee that can be disciplined or fired any time for any reason, other than illegal discrimination or retaliation under the Discrimination, Civil Rights, or Whistle-blower, or similar statutes. The employee's goal should be to keep the employer happy.