This page offers you links to other websites or pages with information on relevant issues for learning to write in English, especially for the production of academic pieces of writing, such as summaries, outlines, essays, etc. You will also find information that cuts across different types of writing, such as grammar in writing, punctuation rules, style, etc. Just click on the link that suits your needs!
General Writing Concerns (from the Online Writing Laboratory at Purdue University's website):
http://owl.english.purdue.edu/handouts/general/index.html
General Academic Writing Concerns (also from OWL):
http://owl.english.purdue.edu/owl/resource/681/01/
Guide to Grammar & Style: http://andromeda.rutgers.edu/~jlynch/Writing/
Grammar, Punctuation, & Spelling (from OWL):
http://owl.english.purdue.edu/handouts/grammar/index.html
Common Errors in English: http://www.wsu.edu/~brians/errors/index.html