Trainer / Bollinger Bands
Read band width, the middle 20-day line, and tags of the outer bands on real daily charts.
The bands have pinched to a multi-week low width. Price just pressed the Middle Band. What is the most useful next read?
Press 1–4 Or A–D To Answer. Chart Stays Mystery Until You Commit.
Every candle is real Yahoo Finance daily history across a 36-setup verified pool (9 lesson types × 4 real-world US stocks). Bollinger Bands use a 20-Day SMA ± 2 population standard deviations. RSI Value uses a 14-Day Lookback (Wilder RSI). Moving Averages use the 20-Day and 50-Day Simple Moving Averages (each setup includes ≥60 warmup bars so the 50-Day SMA is real from bar 0). Each reveal measures the next 8 trading days (~1.5 weeks) as a consistent swing-study window (daily indicator setups typically play out over 5–15 trading days rather than 1 day, though there is no fixed rule). After you answer, tap any Real-World Stock Example card to play that sibling setup on the main chart. Sessions shuffle unseen questions first and reshuffle A/B/C/D so you cannot memorize letter positions.
Bollinger Bands plot a 20-day simple moving average with an upper and lower band two population standard deviations away. The middle line is the average. The bands are a volatility envelope, not a pair of automatic buy and sell buttons.
This module drills three beginner reads: a Squeeze that often precedes expansion, a Lower Band tag that can mean-revert toward the middle, and an Upper Band walk where fading every touch is the trap. Each chart hides the company until you answer, then plays the next 8 trading days.
A Bollinger Squeeze is a multi-week pinch. The upper and lower bands pull tight around the 20-day middle line because realized volatility has dried up. Quiet bands are not a forecast of more quiet. They are a coil that often resolves with an expansion.
The lower band is the bottom of the volatility envelope, about two standard deviations under the 20-day average. A tag down there can be a mean-reversion setup when the candle rejects — a wick through the band and a close back inside — and RSI is washed out but not required to print a fantasy reading like 10.
In a strong advance, price can close at or through the upper band for several sessions. That pattern is a band walk. Volatility is expanding upward and the average is chasing price, not capping it.
A 20-day simple moving average with upper and lower bands two population standard deviations away. The middle line is that 20-day average.
No. A tag is information about location and volatility. Strong trends ride the Upper Band, and a Lower Band tag still needs a reclaim before it looks like a bounce.
Eight trading days, about a week and a half, is the shared study window for every drill so results can be compared. It is not a market rule that swings must end on day eight.
No. The charts are historical Yahoo Finance sessions for chart-reading practice. Nothing here is a recommendation to buy or sell a security.
Upper Band, Lower Band, And The Squeeze. Width Is The Coil — Expansion Chooses Direction.
Middle 20-Day Line is the average. Upper and Lower Bands sit 2 Std Dev away. A Squeeze often precedes expansion. A Band Walk rides the Upper Band — do not auto-fade every touch.
Overbought 70 And Oversold 30 Are Conditions. Read The RSI Value, Not A Trade Instruction.
The Current RSI Value is the score (example: 74.2). The quiet subtitle 14-Day Lookback is only the setting. Below 30 is Oversold. Above 70 is Overbought. Divergence is a higher price high with a lower RSI high.
Golden Cross: 20-Day Crosses Above The 50-Day. Death Cross Is The Opposite Cross.
The 20-Day SMA reacts faster; the 50-Day SMA tracks the swing trend. A rising 50-Day often supports pullbacks. A 20-Day crossing above the 50-Day is a Golden Cross. A falling 50-Day can reject bear-market rallies.
Every candle is real Yahoo Finance daily history across a 36-setup verified pool (9 lesson types × 4 real-world US stocks). Bollinger Bands use a 20-Day SMA ± 2 population standard deviations. RSI Value uses a 14-Day Lookback (Wilder RSI). Moving Averages use the 20-Day and 50-Day Simple Moving Averages (each setup includes ≥60 warmup bars so the 50-Day SMA is real from bar 0). Each reveal measures the next 8 trading days (~1.5 weeks) as a consistent swing-study window (daily indicator setups typically play out over 5–15 trading days rather than 1 day, though there is no fixed rule). After you answer, tap any Real-World Stock Example card to play that sibling setup on the main chart. Sessions shuffle unseen questions first and reshuffle A/B/C/D so you cannot memorize letter positions.
8 trading days (about 1.5 calendar weeks) is a uniform study window used across every drill and example so you can compare outcomes apples-to-apples — not a fixed market rule. Daily Bollinger Band, 14-Day RSI, and Moving Average swing setups normally play out over roughly 5 to 15 trading days rather than in a single day, whereas 30+ days often turns into a new macro or earnings story.
36 real setups across 9 lesson types. Each run deals fresh unseen questions first. Answer choices shuffle A/B/C/D every round so you learn the chart — not the letter.
