Where do I study online

I need to be educated, to know how to read and write

From your questions you seem to write English well. The more you read and write, the better you become. For other subjects, the Khan Academy at the link below has over 2500 lessons on YouTube that you can watch. It covers most everything in math and many other subjects. It's free and you can watch each one until you understand it. If you learn everything on those videos, you will be well educated.

http://www.khanacademy.org/