In addition, people can gain more knowledge by using the internet,the most useful technology in the world.
... the latter part does not make much sense.
Many people such as students can take online courses to study at home or they can watch beneficial videos which also teach them knowledge.
this is a good example. Very good!
Not only students but also everyone could get more information and knowledge.
... this again, goes out of your flow. Expand on the above example and that's enough for this paragraph.
This is because people who have no time or have financial problems could travel around the world by using the internet.
This is because, the Internet eliminates geographical and time barriers by allowing people to interact with each other more efficiently and conveniently.