A vector has a magnitude and direction. The length of the line shows its magnitude and the arrowhead points in the direction. We can add two vectors by joining them head-to-tail. And it doesn't matter which order we add them, we get the same result.
We can also subtract one vector from another. First, we reverse the direction of the vector we want to subtract, then add them as usual.
We can add vectors by adding the x parts and adding the y parts.