There are a couple of good ways to learn how to spell words. One help that we didn't use to have is the spellchecker. Use it to find the misspelled words in your text. (It won't tell you if the words have been used properly.) Once you have identified the problem words (the first step) there are a couple of ways to remember how words are spelled. One is with nmenomics. An example of that is that it is necessary to have one cap and two socks. Thus: necessary. Another way is rote. For example, use the problem word in a sentence, writing it twenty or thirty times. (I didn't promise you it would be easy.) Example: "It is necessary that I do this." You might use either method or both methods.