What policy, provide by a typical ISP, should be read and understood before performing any port scanning outside of your private network?

acceptable use policy (AUP)

Explanation:

Based on the information provided within the question it can be said that the type of policy that this statement is referring to is an acceptable use policy (AUP). This is a policy that states all the rules that have been applied by the owner, creator or administrator of a network or service, explaining what is allowed and how the network should be used.

you paid for the subscription lol

given the lack of choices, i'm gonna wing it and say that pushing your car off a cliff might not be the best idea. your car might sustain damage from the fall and will probably result in the car being too damaged to jump start.

if that's not good enough, avoid filling the car with bees. bees might get agitated when trapped or during the moving process, and might result in death or painful stings that will make jump starting your car very difficult. but in the event that you do choose to fill your car with bees, remember to wear protective gear!