How do I tell my boss I'm leaving? (nicely)?

You can say "I want to give you two weeks notice that I will be leaving. It has been a pleasure working for you and I wish you good luck in the future"

Tell him that you are leaving and this is something that I need to do. It is going to better my life and make me happy.

Tell them that you are having some personal struggles and you think it would be best to leave. Do this about a week or two in advance so they can prepare for you leaving.

tell them at first how much you were happy working for them , and you've learned so much from them , appreciate him and no matter how you thank them it's not enough .. but it's time for you to do some thing new .. and you've to leave them to new step in your life and so on ..

Be honest and give only the needed information. Thank them for the opportunity to work there, and ensure you provide them with enough notice in advance of leaving.

You can put it in writing. A formal letter and in the end thank the company (or your boss) for the opportunity, etc. After that you can thank him (if you want to you can give a small token of appreciation like a personalised coffee cup or a card) and express your gratitude in person.

This can vary greatly because it depends on very many variables. Without knowing anything more, I can suggest that you set aside any emotions you may have attached to the reasons for your departure and write it down on a piece of paper. Then you could reflect and make a list of all the positive things you learned or experienced during your employment. This will help you have a clear picture of your growth and and once you can comfortably state the without getting emotional, you ask your boss for a meeting. During this meeting you

You have to be direct and politely as you tell your reasons. Remember to keep your tone leveled too.

Just be honest and courteous, smile and make sure to pull him to the side after the days work to talk privately.

You obviously have many choices. My opinion, I believe if you are simple you will be nice. If you really wants to leave you should not be too nicely. Because, he will want to keep you and bosses wants nice people to represent their company.