My first recommendation is Richard Lederer’s www.verbivore.com . He has a wealth of information on many topics. He’s written more than 50 books on language, humor, and history. To give you just a taste, here’s what he writes as his opening paragraph of his website:

Welcome to the website woven for wordaholics, logolepts, and verbivores. Carnivores eat meat; herbivores eat plants and vegetables; verbivores devour words. If you are heels overhead (as well as head over heels) in love with words, tarry here a while to graze or, perhaps, feast on the English language. Ours is the only language in which you drive in a parkway and park in a driveway and your nose can run and your feet can smell…

If you have any questions about the English language, Richard is your man. You can email your questions to him, and he’ll be glad to give you an answer. You’ll find much of pleasure and of interest at his website. I recommend it to you.

Another of my favorites is Writer’s Almanac. If you sign up, you get a daily email that takes five minutes or less to read. It starts with a poem, sometimes contemporary, sometimes from the past, and continues with snippets of history—mostly about writers. Sign up for the email newsletter.