If you're like billions of other people in the world, chances are at some point you have been confused about how to spell a word. Spelling is difficult, because there are many rules, but the rules are not always applied in the same way on all words. Also some words, like names, are spelled differently by different people.
Everyone has different words that they have difficulty spelling; therefore, your trouble words may very well not be commonly misspelled by others. Every rule is not going to apply perfectly to every situation. The best way to acquaint yourself with proper spellings is to read and write constantly, and to use Spell Check and other tools available to you.
Here are a few hints to help you out in tough spelling situations; but remember, the English language is extremely complex.
Reviewing a list of commonly misspelled words is not going to teach you how to spell everything; however, it will acquaint you with some words that tend to be problems for a vast majority of people. Please note that the spelling in the list below is correct; any other spellings of words are not correct in American English.
The best way to improve on spelling is to practice, and to look up words that you are unsure of, as opposed to just guessing the correct spelling.