The knowledge of a few basic spelling principles can be beneficial to everyone, regardless of their spelling ability.
Understanding the reasons for such spelling principles as: doubling consonants like 't', 's', 'p', 'l', 'm', 'n' or dropping the final 'e' before adding a suffix can help everyone improve their spelling.
Keep it handly and remember that the more conscious you are about the accuracy of your work, the better you will become!!!