In one sentence, describe what the following article is about:

Once you have finished writing the card, read it over and check for any errors. If you are handwriting the card, you may write out a rough draft first and check it over before you write it on the actual thank you card. If you are creating the card online, you can edit it for errors easily before you send it out.  Try reading the note backwards to check for spelling errors. Identify all the punctuation used in the note and make it sure it is correct. Double check the spelling of the person’s name in the note to ensure it is correct. Look over the note for flow and tone. Check that the note includes a specific mention of the gift or service you are thanking the recipient for. Make sure the note has a friendly, intimate tone, especially if you are close to the recipient. Try to keep the language in the note simple and easy to read. The message should be short and to the point. Once you feel the thank you note is at its best, put it in an envelope and send it out within a month of receiving the gift or service from the recipient. A month is just long enough for the recipient to remember giving the gift and will ensure they are thanked promptly for it. The sooner you can send out the thank you note to the person, the better. Any longer than a month can seem a little rude or tardy for a thank you note.

Summary:
Check the note for spelling, grammar, and punctuation. Make sure the note is easy to read. Send the card out within a month of receiving the gift.