Writing Goals is important because it allows you to set certain objectives to strive for. Goals don't benefit every person in the same way, as it could be less efficient for certain people.
To make an efficient, SMART, goal, there is one acronym that I've already used once in this sentence: SMART
Specific: Put it in numbers, with real deadlines
Measurable: Make sure you can actually reach your goal
Attainable: Work towards a goal that is challenging, but possible
Realistic: Know what you are capable of
Time-Bound: Give yourself a deadline
Hope this helps!