No, they are not required. It is just polite.
Unless local laws specify otherwise wherever you live, an employer does not have to give you any notice.
How much notice does an employer have to give an employee when changing their schedule?
2 weeks
A past employer may give a prospective employer an overview of the employee's employment record. They can give their opinion about the employee's character.
The way that an employer would refuse to give an employee a handbook is they are trying to with hold a benefit.
There is no maximum amount of overtime; your employer must pay you overtime wages (usually time and a half) for every hour over 40 hours in a week.
Minnesota is an at will employer state so it means an employer can terminate an employee at any time for any reason. If a person gives their 2 week notice and they are then fired they may be able to collect unemployment.
No
If you are hourly/weekly paid, then give a weeks notice. An employee in a factory would give this length of notice. An office worker, on a monthly salary, would probably give a month's notice. A lot depends on the terms and conditions of your employment.
No employer is under any obligation to pay an employee who gives a two-week notice the additional two weeks. An employer can accept your notice but not accept the date of your notice. The notice is supposed to be the employee's attempt to eliminate or minimize the employer's trouble for the employee having left the position, by giving his/her employer time to find and train a replacement. But whether or not your employer decides to keep you on for additional time after you've submitted your notice is between you and the employer. Your employer is under no more obligation to keep you there than you are to stay there an additional two weeks. It's important additionally to see if the state in which you live is an "at will" state. In many states, an employer can essentially hire or fire for any or no cause.
Contracts will always deal with notice issues. There is no legal minimum of holiday pay - it is unregulated.
Labor laws cannot be negated by contracts. An employee cannot give up the right to overtime pay or minimum wage.