GD Good luck is a simple and very useful application to help you record and learn words of a foreign language, it allows you to look at the words you want to learn and review them when you have free time, for example when you are waiting for a bus. You are on the train to memorize them quickly and here you decide which words are most important to you, for example words specific to your work. It also allows you to write down the things you will have to do in the near future.