Bollinger Bands

Understand the idea

Bollinger Bands plot a moving average with bands based on price variation. A touch does not require mean reversion, and narrow bands do not determine the direction of a later move.

A decision to think through

Compare a trend that rides a band with a range that repeatedly returns toward its middle. Use the chart context before choosing a strategy.

Try it through free practice

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• Explain the evidence available before the outcome.
• Read the feedback and identify one change to your process.
• Revisit the decision later and check what you remember.

Your next free learning challenge

Play five free trading decisions. Make five decisions, read the explanation after each answer, and try to state the condition in your own words. First-time correct decisions earn skill XP; later reviews check what you remember. You can then apply the idea in a chart round and inspect the replay. All games, levels, written lessons, and feedback are free, with no signup or real money.