The english class in PL

Hello I have to write and present subject. Can you tell is that correct?

Killer technologies – Internet.
Nowadays almost everyone in the world have had a contact with computers. A great part of them has been using international computer’s net known as Internet. It’s a really great invention. It’s give us so many new possibilities. Like sending e-mails, online shopping, online games, online encyclopedia and search engine. It helps a lot in nowadays live. Things which were use before Internet is called now retro. Like sending letters in post office, or going to shop to buy something, or play board games, or looking sentence in encyclopedia.
Almost every device now have a connection to the Internet. Earlier only PC can use this connection. Now PC, cell phones, even TV or DVD player can use Internet. More and more things people can do thanks to it. I use internet to see what is going on in my family company. Even now thanks to my cell phone I can watch what my cameras see in my company. I also can control my PC while I am here.
So no debut it’s a great invention and spread across the world really quick So for sure it can be called killer technology.

Thanks for your help.