Try to scan the Bitcoin whitepaper it will help you to get ideas or additional information. Making an essay is a little bit difficult but if you're fluent in english then it would be easy just expand your opinions on you can compose your own words about bitcoin. Try also to search some articles about bitcoin and also the whole cryptocurrency.
I think the main purpose of creating bitcoin is like that, satoshi nakamoto wants to create a digital currency that cannot be controlled by others, so only those who have bitcoin can control it and can be used as the safest and fastest transaction solution.
Some bitcoin transactions are not safe due to those hackers that can enter a certain platform that you are using.
If you are really careful about sending a bitcoin in a right addresses then you will not have a problem in making transactions.
Also, I think the reason why Satoshi Nakamoto made this digital currency is for people to have an asset where they can benefit for life due to its importance and benefits in the economy. Although, it is volatile in the market, with the use of bitcoin, we should handle our asset carefully and we should know how to deal with the market effectively.