How would this work? The Sun blasts out radiation all the time. Radiation that strikes a large, shiny, sail-like structure would push on it, much as the wind pushes on a sailboat. Although the push would be very gentle, it would be constant. Over time, the spacecraft would be going very, very fast, using no fuel at all!
You may have heard of the “solar wind.” Solar wind is made of particles blasted out from the Sun. Solar sails do not “catch the solar wind.” Instead, solar sails use the force of the light itself. This force is much stronger than the force from the solar wind.
Of course, such a thing would have to be GIGANTIC! A light sail as large as Texas would have to be used for propelling a space shuttle sized ship to near light speed, and for the spacesteads that would serve as the crewed ships, such sails would have to be continent size.