Good afternoon :)
In regards to meaning, there is no difference between "internet" and "the internet." "The" is an article adjective used in English to indicate a subject, thus it is placed in front of nouns (i.e. "internet").
"Some people believe that the Internet This is not a proper noun and shouldn't be capitalized. has a positive impact on students by providing a variety of resources for their studies. However, I strongly disagree with that claim since the internet brings some negative effects on students such as internet addicts and the increased reliance on the internet in regards to homework.
First, many students are becoming addicted to the Internet. They spend more and more time playing computer games or just surfing the net without any particular reason. Accordingly, the time they spend on studying is automatically reduces, which in turn causes lower academic achievement. Moreover, some of them go to the extreme, becoming serious internet addicts, and they even refuse to go to school as they cannot escape from the trap of the internet.
Second, the internet hinders students from doing their homework or assigned tasks on their own. Thanks to the internet, students can obtain the information they need with a great ease by simply clicking the button. However, this great accessibility to any kind of information can be abused. For instance, when students are given an assignment, what many of them do is just go on websites or blogs where the seemingly needed information is posted, and drag, copy, and paste it without looking the material thoroughly later. This is called "plagiarism," and is illegal. Some students even just download the material which someone else has already done and submit it as if it were their own work.
It is clear that the internet has serious detrimental effects on students. For one thing, students are so vulnerable to becoming addicted to the internet. Additionally, they do their homework not with their own efforts but with the entire dependence on internet resources. Thus, young students should use internet with great caution to prevent any harmful effects."
Very nice job. You make some very good points, and your introduction and conclusion are very clear and concise. Good work.