For example, you might say that you are all set to go for a trip, meaning that you have packed your bags, checked your passport, and done everything else you need to do in order to leave. Or, you might say that a project is all set to go, meaning that all the necessary planning and preparation has been done and the project is ready to be started.
The phrase "all set to go" is a positive and optimistic expression, and it conveys a sense of confidence and readiness. When you say that you are all set to go, you are essentially saying that you are ready for anything that comes your way.