How to quit a job you just started?

TL;DR

To quit a job you just started, treat it as a normal professional transition, not an emergency. Resign directly and briefly, give proper notice even after a short stay, and offer to help hand off your work, since how you leave matters more than the fact that you are leaving.

Insights

The first step is to get clear on why you are leaving before you act, so you know it is the right call and not just a reaction to first-week nerves or a rough onboarding. Once you are sure, keep the decision simple. A role that is not the right fit does not require a detailed defense, so there is no need to build a case or list every frustration.

When you resign, do it directly and respectfully. Have the conversation with your manager in person or on a call rather than over text, keep the reason short and neutral, and thank them for the opportunity. The part that actually protects your reputation is the exit itself, not the reason behind it. The biggest risk is skipping notice, because that is what people remember and what burns the bridge.

Give the standard two weeks even though you have only been there a short time, and offer to help with the transition so your work is left in reasonable shape. Then treat the whole thing as useful information about what you actually want, and carry that into your next role instead of dwelling on the misstep.