(Simple) moving average (SMA) crossover: Calculate rolling averages on different window sizes. Do something when they cross over each other.
To take long position in a stock: Buy stocks at a low price; sell them when the price gets high. Used when you expect the stock to increase in value.
To take short position in a stock: When you expect a stock to decrease in value, borrow some shares from your broker, sell the shares to other investors at the current price. When stock price decreases to a desired amount, buy in shares and return to broker.
Can be used to evaluate non-deliberate stock-picking criteria, such as Google trends.
A family of ETFs. (Wikipedia)
A trademark of Standard and Poor's Financial Services LLC, a subsidiary of S&P Global.
Designed to track the S&P 500 index.
A good benchmark if you are primarily buying large cap US stocks.
NYSEARCA: SPY on Google - "SPDR S&P 500 ETF Trust"
Designed by the Chicago Board Options Exchange (CBOE).
Implies 30-day volatility from S&P 500 Index.
It's "implied" -- it does not directly measure the real volatility.
Also available as options & futures.
Not really ETFs in the common sense -- the VIX ETFs track VIX futures instead.
This actually makes sense -- in this way, VIX is able to capture how traders expect the stock market to go.