Here you will find resources on the teaching of writing and links to scholarly sources for theories and best practices. You will also find resources for the writing process. Please let us know if you have favorite resources you would like to see added to this guide.
A usage guide or grammar guide is a book that illustrates how to use English correctly.
The best-known guide deals with the basics of how to write "plain English" -- this is the classic
- The Elements of Style / by William Strunk, Jr. ; with revisions, an introduction, and a chapter on writing by E.B. White
PE1408.S772 2000 -- online here
Here are ONLINE grammar guides, from 2016+
Here are links to selected excellent university writing centers in the U.S.
These sites include guides to all aspects of the writing process, discussions of writing in different disciplines, help with grammar and punctuation, citing sources, and more.