As mike said, MS Word and almost any text editing software will have an inbuilt spell-checker.
Whoever told you it isn't important is just being silly, of course it's important.
However, looking at the questions you've asked so far, I can understand each one and really, you're not anywhere near as bad as a lot of the posters here.
The biggest (although not really that bad) mistakes I can see are lack of capital letters and some punctuation.
However well you spell or grammatise, you'll always have the ''Spelling Police'' after you on here, lol.