how can I explain in my own words the difference of a scalar and a vector?

How do I draw a vector to represent the folllowing

a) The velocity of a fishing boat travelling at 8 knots on a heading of S75^oW

d) The force exerted by a chain hoist carrying a load of 200kg.

This is the most confusing for me. The points A, B, C, D, E, F, G are equally spaced along a line. Name a vector which is equal to 3(BD)Vector arrow symbol on top BD.

b) 1/4EA(Again Arrow symbol)