Purdue OWL
https://owl.english.purdue.edu/owl/
The Purdue Owl is a great overall resource for English because it incorporates grammar, writing, etc.
Grammar:
https://www.khanacademy.org/humanities/grammar
https://www.merriam-webster.com
http://grammar.yourdictionary.com/homework-help.html
Writing essays:
https://www.youtube.com/watch?v=KlgR1q3UQZE
https://www.fastweb.com/student-life/articles/essay-tips-7-tips-on-writing-an-effective-essay
A link to my teaching Pinterest board:
https://www.pinterest.com/jbayliss1/eaching-and-learning-with-technology/
Link to my English board:
https://www.pinterest.com/jbayliss1/bayliss-english-board/
Literature:
https://www.youtube.com/watch?v=MSYw502dJNY&list=PL8dPuuaLjXtOeEc9ME62zTfqc0h6Pe8vb
College ACT prep:
https://blog.prepscholar.com/how-to-get-36-on-act-english-9-strategies-from-a-perfect-scorer