* Reaching Ceres with a robotic spacecraft? This has already been done! NASA's Dawn mission arrived in orbit around Ceres in 2015 and spent several years studying it.

* Sending humans to Ceres? This is a very difficult and distant goal. Currently, there are no plans for a crewed mission to Ceres.

* Traveling to Ceres at the speed of light? Even at the fastest speed possible, it would take several years to reach Ceres.

To give you a more specific answer, tell me what you are interested in!