Internet helps to learn lots (или a lot). (можно по-другому: Internet helps studing.)
To find more information, download the required essay, watch video about some books which you have already read, everything can be done through the Internet.
Email is one of the advantages of the Internet.
This online service is cheaper than regular mail, and it works much faster.
You never lose touch with loved ones, wherever they are using such mean of communicatoin.
I have a personal e-mail and have an oppotunity to chat with my friends from other cities and countries.
Nowadays there are very different popular social networks where communication with your friends and relatives also is not difficult.
Today there are many different Internet competitions for different subjects which give students the opportunity to participate even in international competitions.
On the other hand I think that the Internet becomes a way of a person life and it is very harmful for our health. Many teenagers spend a long of time sitting at the computers and spoiling their eyes. I don't mean that I am against the Internet, but it should have reasonable limits.