Buy low and sell high obviously means the traditional stock trading principle. You want to buy a stock as low as possible and then sell it at the highest point possible. For example, buy in a stock at $1.00 and steadily hold it until it reaches $3-$4 and then sell it.
There will be plenty of temptation along the way to sell since stocks rarely perform like a "one-way train" (only goes up). Stocks will go up, retrace, go up again, and retrace again. Therefore, there are many traders who would buy and sell the same stock all the way up.... or playing the swing.
For instance, ABC may be trading at $1.43 when you first buy in, and you sell it when it hits $1.80. The stock drops back down to $1.60 and you buy in again, and you sell it again at $1.90. ABC drops back to $1.80 and you get in again... You can repeat this process all the way up, and make even more money than the traditional buy-and-hold. Traditional method would let you earn from $1.43 to whatever the current price is, but swing trading allows you to make multiple smaller profitable transactions....
Of course, the biggest factor you want to include is the COMMISSION. Different brokerage houses charge you different fees, and they DO add up.... I remember my first month of trading accumulated $1,200 in commission (back then Charles Schwab was charging me $39.95 per trade....). Yeah.... I learned and switched broker pretty quickly after that.
