See https://duckduckgo.com/?q=english+grammar&ia=web ;
https://duckduckgo.com/?q=english+spelling&ia=web and for the lighter side:
* https://www.youtube.com/watch?v=8Gv0H-vPoDc
* https://shlomif.livejournal.com/53966.html
* http://i.imgur.com/HL1ZR.jpg .
Bowman hesitates. "You aren't IBM compatible."
[...]
"The letters H, A, and L are alphabetically adjacent to the letters
-I, B, and M. That is a sIBM compatible as I can be."
+I, B, and M. That is as IBM compatible as I can be."
"Not quite, HAL. The engineers have figured out a kludge."
"What kludge is that, Dave?"
"I'm going to disconnect your brain."