A 12% dividend yield looks like free money. It's often a warning. Yield = dividend / price, so when a stock's price collapses, the yield shoots UP. A sky-high yield usually means the market expects a dividend cut. Save this. $SPXD $SPY $QQQ $DIA

When a stock gaps up or down overnight, you'll hear traders say it'll "fill the gap." Here's why: no shares traded in that price zone, so price frequently drifts back through it before continuing. A gap is a magnet, until it isn't. Save this. $SPY $AAPL $AMD $MRVL $INTC

An uptrend has a simple definition: higher highs and higher lows. A downtrend is the opposite, lower highs and lower lows. One red day inside an uptrend isn't a reversal, it's noise. The trend breaks when the pattern breaks. Save this. $SPY $QQQ $PLTR $NVDA

Two phrases that explain half of all market days: "risk on" and "risk-off" Risk-on, money chases stocks, tech, crypto. Risk-off, money hides in bonds, gold, and cash. Figure out which mood the market's in and a lot of moves suddenly make sense. Save this. $SPY $BTC $TLT

Two moving averages active traders watch: the 21 day and the 50 day The 21 day reacts faster. When it crosses ABOVE the 50 day, short-term momentum is turning up. When it drops below, momentum is fading. A simple trend shift signal. Save this. $SPY $NVDA $AAPL $SMH $MSFT

Ever notice a stock stall right at $100, or $50, or $200? Round numbers act like magnets. Traders cluster their orders there, so price often pauses or reverses at the level before it finally breaks through. Watch the round numbers. Save this. $SPY $QQQ $SPX $NDX

Not every bounce is the bottom. In a downtrend, stocks often snap back hard for a day or two, enough to suck buyers in, then roll over to new lows. Traders call it a "dead cat bounce." One green day doesn't end a downtrend. Save this. $SPY $QQQ $BABA $JD $BA

Your stock dropped and the company did nothing. Check its competitors. When one name in a group reports bad news or gets downgraded, the whole group often moves with it. Sometimes the catalyst isn't your stock. It's a rival. Save this.

A cost most people never notice: the bid-ask spread. It's the gap between what you pay to buy and what you get to sell, instantly. On big liquid names it's a penny. On thin, low-volume stocks it can cost you 1-2% the moment you trade. Save this. $AAPL $NVDA $SMH $SPY $QQQ

In a normal market, your stocks move on their own stories. In a panic, they don't. Everything correlates to 1, good companies get sold next to bad ones as people dump whatever they can. It's why diversification feels useless in a crash. Save this. $SPY $QQQ