What is the differences between all these different mortgage terms?

Cindy16 questioned: I am looking into different mortgage.
Get very confused by so many different kinds of them.
What are the differences?

If we are plotting to get a 300K mortgage, and plotting to stay in the house for at least 5 years.
What mortgage might be excellent for us?

30yr fix
5/1
7/1
why there is 5/1 ARM?? What is the different between all these?

thank u