Oh, forgot the phonology stuff.
The most interesting thing is probably to look at the page on the dialect or accent where you're from or elsewhere that you have a connection to.
Here is the North American English regional phonology.
Here is a page on regional vocabulary. For people in the UK and Ireland, you should be able to find your region or city
here. Here are the pages for
Australia,
New Zealand and
South African English.
It might be a bit tough to understand some of it, especially those without word examples, if you are like me and not familiar with the phonetic alphabet. IMO it's worth taking a few seconds to look at the
IPA chart for English dialects. There were a few things that I either hadn't noticed people there doing, including myself, or that I didn't notice were odd. For example, for me rang and rain have the same vowel sound and I pronounce leg and egg layg and ayg.
It's probably meh otherwise, but if you too have gotten into arguments with more than one English person because they denied adding an r to the end of words that end with uh, then you will enjoy this
page on the linking and intrusive r in non-rhotic dialects. It is also discussed on the
main page about the difference between rhotic, those that pronounce the r in card, and non-rhotic accents. I think it goes beyond the case where the next word starts with a vowel, because I have definitely had an Englishman tell me "I don't say Americker, I say Americker."
You probably have to be really in the mood to nerd out, but here is the
phonological history of English. It goes through, with a lot of examples, how pronunciation has changed over time. The really old sections make no sense, but I found a lot it from the Chaucer section on interesting.