Please correct my note

Today I studied English in teacher training
The class is about communication of other teachers.
It is difficult but also fun and interesting.

In last class we heard a song called 'Imagine' by John Lennon.
The song told me to imagine the world with no greed, no war, no country but be full of peace, happiness, and love.

Today's class was to discuss about 'the perfect world'.
Everyone said they're thinking about 'What is the Perfect world'.
I think the perfect world is everyone to think 'My achievement is based on my effort and other people's help'
Many people forget that other people help them unnoticed in everywhere.
Everything we used is one of making other people. ((I don't understand what you are trying to say.))
So we have to do our best to help other people like receiving somebody's help. ((You could say, "Like they help us."

I dream of the perfect world, although it is impossible.
First of all, I do my best to make the world ((You could say, "to make the world a better place."))