"In life as  in football , you won't go far , unless you know where the goalposts are".

This means that if you don't know what your goals are or what you want to be in the future. You have to think of what you want to be in the future for you could have goal or achieve something. For example if you want to have a good wealthy life for you in the future. You are don't going to get that life only saying you want it and they give it to you . First you must past through some stages like study/go to school. Then you have to find a real job and work because you need the money , and then you saved to have you house , car , etc. Probably you sometimes in a while get some some hard stages or the windows open and close for you that is ok . Why u might think, because when you think you don't know you have to get back up and try again. Just remember that there is always going to be challenges in life . But you have to also learn how to let Challenges lose and don't stress out about them. But at the same time always try your best.