Right
Wrong 

English is most important for to me. Learn hard, work hard....
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Who is English important to? Me. Because it's 'most important', 'for' sounds awkward.

Or, alternatively,

"English is the most important subject for me." 

First notebook entry: Introducing myself

English is the most important subject for me. "Learn hard, work hard!"

or you can just simply say: English is important for me.

First notebook entry: Introducing myself

English is the  most important for me. Learn hard, work hard....