Resigning is more than just a simple I quit. There are still a few key parts you have to make sure to follow:

Timing – make sure to give your boss/ manager enough notice. It’s traditionally 2 weeks, but consult your boss in case he or she wants or expects more time

Negotiating: make sure that you talk to your boss about getting a fair return on any outstanding salary or any other compensation that is owed to you.

Hiring: you may want to offer to help your boss with training of other employees

Working: make sure that you do your best to actually come to work as you did in the past. Even though you are leaving, you should do as if you were not.

Completing: make sure you complete any assignments or tasks that you have to fill. Leave a detailed report of progress for your coworkers and supervisor

Leaving: before you walk out of that door make sure you have all of the contact information you need and / or want. Remember to again thank them before you leave.

On another note, some industries will require you to leave on the spot. Be prepared for this.
Don’t feel guilty, your coworkers and even your boss may make you feel a little guilty for leaving the team, don’t let this get to you.

Example:

Dear X manager/ boss

Please accept this letter of resignation to be effective at a date to be mutually determined, but no later than x date that you need to be out by.

I am resigning my position because I have decided to purse x career. This resignation is the proper thing for me to do. I have benefited greatly from my stay here and I appreciate how you always held yourself in a professional manner.

Sincerely,

Your name