This is one part of my essay, just hope you can help me to revise it.Like a teacher?

[lisa]

I am not an english speaker
In most cases, technology is just a tool for our mankind. Different people use it in different aspects. For instance, new electronic devices such as computers can help to keep students’ learning curve high. However, some teenage engaged themselves too much playing computer games and brows porn movie. Therefore, computers only bring visual deprivation and cerebrum fatigue to their life