Teck Resources Ltd (NYSE: TECK) has seen its outlook change dramatically over the last few years. When commodity prices started to tumble in 2011 investors worried the forecast was bleak at best. As commodities started to come back in 2016 that worry subsided and the stock price rocketed higher by more than 450% in a single year. Here are five things you should know about Teck if you are looking at it today.