"I want to get better at maths" and "I want to raise my maths test average from 65 to 75 by the end of this term, by redoing every practice paper and reviewing one mistake a day" are not the same kind of statement. Both describe a wish for something better. Only one of them tells you what to actually do, and how you would know if it worked.
SMART is a simple framework for turning a vague wish into a goal with an actual shape, something specific enough to act on and clear enough to check.
This section walks through what each letter means, and gives you practice turning a real, vague goal into one that could genuinely be followed through on.