were i could find a common rules of english spelling
Guide to English Spelling Rules | DavidAppleyard.com
Susan Jones' Spelling Rules
Dictionary of English - spelling rules
English Rules | Grammar Rules | Punctuation and Capitalization Rules
Spelling Rules ebook download in PDF format
English Spelling Rules - Compare Prices, Reviews and Buy at NexTag - Price - Review
English spelling rules grouped into nine categories
The Riggs Institute
English Spelling Rules on one page - OzIdeas
There are many sites.
You can also ask here.
José Manuel Rosón Bravo