Final answer:
Saber and conocer are used differently in Spanish to express knowledge and familiarity
Step-by-step explanation:
Yes, I am familiar with a football player. Saber is used to express knowledge or information about something. For example, I know that Tom Brady is a famous football player.
As for the rules of volleyball, I can say that I know them as well. Saber can be used to talk about knowing facts, such as knowing the rules of a sport.
Regarding skating, Saber is not the verb we would use here. Conocer is used to talk about being familiar or acquainted with people or places. So, you can say 'Sé patinar' instead of 'Saben patinar'.
Learn more about Saber and conocer in Spanish