First notebook entry: Introducing myself

because English is very necessary in my life to communicate with people, as many know him, and he helped me to perfect

English is an essential language to know in the global community, as it is recognized as the international language for business. This is why I want to learn proper English. 

If you are using a translator write simple sentences in your language before you translate, so that your meaning does not get "lost in translation". :)

First notebook entry: Introducing myself

because English is very necessary in my life to communicate with people, as many know him, and he helped me to perfect

English is necessary in my life, to communicate with people.

 as many know him, and he helped me to perfect   I do not understand what you are trying to say in these words.

Try to say it a different way.