Ihave a question, what exactly does snappy mean, will it make sense if i use "snappy name" in a sentence? sorry just wondering cause english is not my first language but i try.

It wouldnt make sense because snappy means iritable or inclined to speak and cleverly concise; neat so it wouldn't make sense

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).