People use bitcoin because it is a very good platform for earning money because it provides many ways to earn money. Then secondly, bitcoin is a universal form of currency so it can be used anywhere around the world without the hassle of currency exchange. Then it has very fast transaction. Then it is a secure wallet money can’t be stoked from it unlike regular fiat currency.

Why people used bitcoin? simple because they want a income that's why they used bitcoin because bitcoin can give them a income that they need. I know that some bitcoin user invest here in bitcoin. My friend told me that the bitcoin is a good investment, I don't know why.

It is a platform which is used to exchange money world wide without any prior information about yourself.
It made transaction fast and smart, As other's said it is a source of make yourself rich.
So it may be the money for the future.

Because someone found what they dreamed, I dreamed that the future of the transaction system soon uses bitcoin, it's time to leave the fiat because of many weaknesses, the centralization system only benefits some parties and harms many people.

My opinion in why should people use bitcoin, because bitcoin can help them to their needed's and it can help them to get their own business, so the money that they use to get their business will give them more profit.

 People should use Bitcoin because it is money. Some people become rich when they invest in Bitcoin. So they can make a living out of bitcoin.

The future of coin is blockchain 3.0. So what are the blockchain 1.0 and 2.0 coin? How to develop blockchain 1.0 and 2.0 coin.
Thanks.

Well for me, although bitcoin cant replace the paper money, bitcoin has many attributes like it is faster to use in transaction. People needs to use bitcoin because I think everything now needs a fast and reliable transactions. We can see that bitcoin has limits and paper money does not have limits. But, bitcoin value is rising and rising to point that no one would expect it to be. If more people know about bitcoin the value of bitcoin will sky-rocketed.

It's easy to understand if you use bitcoin because it gives you a profit if you know it, give you rich knowledge, learn English on the forum if you do not use google translate. That's enough for you to use bitcoin and hopefully more people will know about bitcoin.