How much do you know abuot lifeguards?
They surpervise safety and rescuse of swimers and surfers and those in the water, in a beach or pool. 
How would one person become a lifeguiard?
They are strong swimmers who trained in CPR/AED. first aif and then certified water rescue with different aids and equipment depending on the venue. 
How long does it take to begin?
It depends on the type of the lifeguard.  In some areas lifeguards are actual part of the ESS which means they have a lot more training
What is one important thing all lifeguard need to know?
They supervise the safety and rescue of simmers, surfers, and water sports participants at pools, water parks or the beach.  A wide range of places and danger!