Setting a goal is not rocket science -- A goal is simple: it's what you want, and when you want it.
Goals help you focus, keep you accountable, help you decide what action steps to take and are the first step towards success in any endeavor.
SMART goals are achievable and within your power. You can't really set a goal to win power ball, it's not within your control. You can't set a goal for a specific person to fall in love with you either, people have free will, but you could set a goal to meet a certain number of people per week until you find the right person.
Goals should be relevant and rewarding. You should not set a goal to cause harm to others, and why waste time on a goal that doesn't benefit you.
Lastly goals have a deadline. Saying you want something "someday" doesn't get you moving the way wanting it next week will move you.
Set Multiple Goals
One of My lifetime goals is to Hike the entire Appalachian trail. The lifetime goal is a vision or dream but is a little less time-specific, because we all like to think we'll live forever. The long term goal is what will start to narrow that down. Long term goals can be whatever time frame you choose, depending on your age, 5 years may be appropriate or 10 may be better. My 5 year goal is to complete a one to three week backpacking trip. The one year goal is very time specific. I generally set one year goals on my birthday. I also set one year goals on New Years, but I call them One year goals, not resolutions, because resolutions have such a negative connotation these days. Short term goals you review often and should always take you closer to the one year goal which should be relative to the lifetime goal. Daily goals look like a to do list, but when you call them goals, they're a bit different. My short term goal is to hike short trails locally, my daily goal for today was to get 10000 steps.