Goal setting can be an incredibly helpful tool, but often challenging in practice. Just like objects at rest experience inertia — comfort and internal resistance to change make it hard to set the right goals.
People either set goals that are unrealistic, and give up when they realize how hard it is. Or set goals that are too easy, and get stuck in a false positive cycle of getting stuff done but going nowhere.
Realistic goals take current skills and external environments into consideration. For example, if you can currently sell a product, or service — then it’s a lot easier to set a goal of selling double or triple what you currently do than if you had no experience selling at all. Setting realistic goals takes into account what is reasonably possible for you.
For example, if you see a competitor growing their market share fairly quickly — then that is reasonably possible for you too.