"All advances are not created equal," says legendary chart guru Louise Yamada. This is important to remember, ... The ABC’s of Reading Stock Charts. Jeff Macke . Tue, Feb 21, 2012, 7:59 AM.

Alphabet (NASDAQ: GOOGL) (NASDAQ: GOOG) is one of the largest companies in the world (as measured by market cap), but that doesn't necessarily make it a good stock to buy.