Grammar
Grammar Handbook at UIUC
Modern English Grammar by Daniel Kies at College of DuPage
Hypergrammar at University of Ottawa
Guide to Grammar and Writing by Charles Darling at the Capital Community College Foundation
Punctuation Videos
Comma Story - Terisa Folaron (4:59)
Grammar's great divide: The Oxford comma - TED-Ed (3:25)
How to use a semicolon - Emma Bryce (3:35)
When to use apostrophes - Laura McClure (3:14)
Grammar 101 Lessons by Grammarly
Direct and Indirect Objects
Affect vs. Effect (2:02)