This article was overall pretty good, but I feel there were two errors. Primarily, you made it sound like you could put steel strings on a classical guitar. Most know that a classical guitar is not designed to handle the pressure of steel strings, and will result in the neck bending into a bow, until it breaks.

The article also seems biased against single coil pickups. It may be your opinion, or where you got the article from. Or it could be that I swear by single coils for their twang and punch.

You left out eight gauged strings as well. Not very popular, but with a good Telecaster, it can make very nice highs.

When you get into writing your guitar care article, I suggest noting that people should de-tune their guitars when flying, or overall not in use. It is terrible for the neck. Also, the problem with people leaning guitars against walls and such on their neck, also terrible.