After completing an objective, when this time passes or if you buy some guards, you will get the possibility to acquire some advantages. Benefits are long-term and are really beneficial. You typically can pick a free perk. Think about picking those that enhance your damage. If you can manage it, think about going to the Store and acquiring the Power-up that enables you to start at level two when you start a new generation (then at level three later on, when you are large enough). This will save a long time.