The clues are in the job application, so read the details from start to finish. Take notes and create bullet points, highlighting everything you can satisfy and all the bits you can't. With the areas where you're lacking, fill in the blanks by adapting the skills you do have. For example, if the job in question requires someone with sales experience, there's nothing stopping you from using any retail work you've undertaken – even if it was something to help pay the bills through university. It will demonstrate the skills you do have and show how they're transferable.