Grammar

English Grammar
Butte.edu -- 8 Parts of Speech (the best place to start)
Learn English Lab -- The 12 English Verb Tenses
Khan Academy -- Grammar  -- (videos)
Coursera -- UCI Grammar Course
Coursera -- UCI Grammar intermediate
Coursera -- UCI Grammar Advanced
British Council -- Grammar
Wikipedia -- English Grammar -- many translations on left
column.
EnglishPage.com -- Grammar
ESL Cafe -- Grammar
StudyZone -- Grammar
EnglishAnyone -- Basic English -- (19 videos)
Learn English Lab -- Grammar Playlist -- (42 videos)
7 Hour video -- Grammar
Alison -- English Grammar
Udemy -- English Courses ($ but inexpensive)
Thefreedictionary,com -- Farlex Grammar Book

Conjugate.com -- Conjugate verbs
English Club -- Grammar
Using English -- English Grammar Terms
LinguaPress -- Grammar
English-hilfen.de -- Grammar
Learn English Online -- Grammar Resources
Oxford Online English -- Sentence Structure
                          The 8 Parts of Speech
(With Vocabulary for the First 500 Most Common Words)
American English is usually described as having 8 parts of speech.
The British sometimes include determiners and 9 parts of speech.