The following video will discuss the general law of supply. This law shows the relationship between Price and the quantity of a good firms will supply in a market. It is important to remember that the supply curve or "function" represents the entire market supply from all firms in that market.
You will also need to understand the assumptions that underpin the law of supply. You can find more information here.
This video will discuss what factors can cause an increase or decrease in the levels of Supply for a good in a market. These factors are what will shift the curve to the right (increase in supply) or to the left (decrease in supply). It is important to remember these factors (that we call non price determinants) as these are the cause of an increase or decrease in supply.