I want to learn proper English grammar.

I want to learn English grammar correctly.

proper is more of a coloquial way of speaking English.

if you are genuine try englishgrammar org

Happiness

I'm so glad to improve my English with all of th world. I Don't know why I'm so afraid, but I know I can do that

Happiness is something achieved by doing something you enjoy or having something.

I'm so happy to improve my English with (the whole world) (all the world). I don't know why I'm so afraid, I know I can (do it)(achieve it).

please correct my assignment. thank you.

Approximately 70% of (diseases) affecting humans today (are)  (diseases) that can be transmitted directly from animals. (These) (diseases) (are) known as zoonoses. Zoonoses are diseases that can be transmitted from animals to humans or from humans to animals with the same (circumstances). Due to many people who still do not understand zoonotic diseases, we take the initiative to educate the public (so they) know more about what zoonotic (diseases are). In this modern age, the phone development has (quickly) (progressed) and (raised) advanced communication technologies, one of (those) is a smartphone. (People) in large numbers generally use smartphones to communicate and find information, by downloading Android applications, they can store information on their smartphones. Android is an operating system for mobile devices that allows everyone to be able to use their own Android applications. The convenience offered allows us to introduce zoonoses to the public through the Android OS. Applications will be available in Android as named ZoApps. ZoApps are Android applications that provide information about zoonotic diseases that often occur between animals (eg, cattle, poultry, aquatic, and wildlife) and humans. The purpose of ZoApps is to provide information, education, and instructional media about zoonotic diseases that often affect the public health, with the hope to increase the public knowledge of the diseases that can be transmitted from humans to animals and vice versa. Also to raise public awareness to be more concerned about the health of the animal. Therefore, ZoApps applications are expected to provide solutions to prevent zoonotic diseases (the diseases that can be transmitted from animals to humans and vice-versa).

wow i stopped changing content halfway through as I was rewriting  a lot, so I changed it to what I think it should be like, you didn't take this article from the web by any chance did you? hehe well if you did there was a lot of changing from singular to plural throughout (it was badly written). you can read through my correction and compare it to the one you wrote. By the way the end bit in brackets I left  but really this has been explained within the article so has no need to be there. Also Android is an operating system which is required to run android applications  just like windows apps need windows os you can't run an android app on windows os and vice versa you can't run a windows app on android os