The following links will lead you to the the best places where you can learn English grammar, compositions, idioms, quotations, poems etc...
Grammar
http://www.englishclub.com
http://www.edufind.com
http://grammar.ccc.commnet.edu/grammar/
http://www.fortunecity.com/
http://www.englishgrammar.org/
http://www.learnenglish.de/grammarpage.htm
Quotations
http://www.quotationspage.com/
http://www.thinkexist.com/
http://www.quoteland.com/
http://www.aphids.com/quotes/index.shtml
http://www.brainyquote.com/
Idioms
http://www.usingenglish.com/reference/idioms/
http://idioms.thefreedictionary.com/
http://www.idiomconnection.com/
http://www.englishdaily626.com/idioms.php
http://a4esl.org/q/h/idioms.html
http://idioms.thefreedictionary.com/american
http://www.sky-net-eye.com/eng/english/idioms/american
http://www.rong-chang.com/idioms.htm
http://www.idiomsite.com/
Poems
http://famouspoetsandpoems.com/
http://famouspoetsandpoems.com/top_poems.html
http://www.poetrysoup.com/famous_poems/
http://www.memorablequotations.com/famouspoems.htm
http://judithpordon.tripod.com/poetry/id90.html
http://www.famous-poems.org/
http://www.love-poems.me.uk/a_famous_poems_index.htm
http://www.unitedworldpoets.com/famous-poems
http://www.famous-poems.biz/
