Thank you!
http://beginnersinvest.about.com/od/investing101/ss/stocktrading_3.htm
A limit order lets you set a minimum or maximum price before your stock trade gets converted to a market order and sent to the stock exchange. Until you become very experienced, almost all orders should be limit orders to protect yourself.
Why would they recommend this ?
It's part of risk management. If you've ever traded in currencies, you would use these low- and high-level limits to cash out either to avoid substantial losses or to realize your gain (by selling and recouping the profits).
The same principle would apply to most types of trading (trading in terms of daily, weekly or monthly).
If you are a long-term investor, you would increase your limits to a wider margin, so as to avoid small swings, whilst still maintaining a "risk management" option.
I do somewhat agree with bchip, but I would use these tools whether you are a trader or an investor (especially by placing lower limits).
Nope, your describing stop loss and take profits levels, limit orders are a different thing