Internet is definitely/certainly the most efficient way of communication that exists nowadays. You can have acess to it everywhere, anytime and know what happens in the whole world.
More than just knowing what happens in the world, you can contribute and help a lot of people. For example, if you are a student and you want to learn a new language you can talk to a native that speaks this language and improve it faster than you just do a language course.
Imagine that some catastrophe has happened and people are in need of help, by the Internet you can mobilize people to help with food, clothes, refuge, medicines and many others things.
We can find whatever we want on the Internet. Some clicks are enough for us to find what we looked for.
The interaction that the Internet offers us is huge and everyday it is just becoming bigger and bigger. Centuries before, information took too long to spread out and now we have it almost in real time.
The technology of our cellphones is getting better and better to keep us connected all the time and it is very important that people have this way of getting in touch and communicating.
However, we should just be careful because people are more connected and forget the real life. In other words, it is becoming common you see two people talking to each other but at the same time talking to somebody else on the Internet through of their cellphones. People are losing their physical contact because of it.
In short, and taking everything in consideration, the Internet made our lives easier and brought us a lot of tools and resources. In fact, it was designed to encourage us to learn and participate in whatever event that happens in the world and it help us to create a critical view about everything that is around us.
Note: It´s advisable to use just a (prefferably third) person pronoun, when it comes to précis/texts.
Anyway, bearing in mind that you are a begginer, I left it closer to your original version.
If not, following the pattern of the first sentence "Internet is definitely/certainly the most efficient way of communication that exists nowadays." (third person singular)" So, the following sentence would follow that pattern, so:
"One can have acess to it everywhere, anytime and know what happens in the whole world."
It´s just a detail. Now I leave the ball on the Adonay and the proofreaders of the Forum court, I myself might have made a lot of mistakes here, on my hasty correction. Let´s wait further comments.