The phrase "to head for" means to move towards or go in the direction of something. It can be used both literally and figuratively, depending on the context in which it is used. For example, if someone says they are heading out to run some errands, they mean that they are leaving their current location to go do those errands. On the other hand, if someone says they are headed towards success, they mean that they are working towards achieving a goal and moving in the direction of success.