Outstanding Share Count.
Look at their past several 10Q's (quarterly financial reports) and write down the number of outstanding shares. If you see 450,000,000 shares then 1,100,000,000 shares then 1,900,000,000 shares then it means the company is selling shares (also called "diluting") to either stay afloat & pay their bills, or they may be pumping and dumping (pumping the stock up with awesome press releases while simultaneously dumping shares onto the open market).
Steer clear. Don't buy.
The more they dilute the share structure, the less each share of stock is worth.