Explanations of MLA, APA, the basics of writing a business letter, résumé writing and much more is available at the Purdue Online Writing Lab (OWL) website. The information available to writers of all types and abilities at OWL is both broad and deep. This is quoted directly from the website —
“We offer over 200 free resources including:
- Writing and Teaching Writing
- Grammar and Mechanics
- Style Guides
- ESL (English as a Second Language)
- Job Search and Professional Writing”
OWL even has a set of podcasts available that cover rhetoric, logos, pathos, and ethos. It’s worth the time to check out and explore.