Reading Volatility Lines

While Trend Trading and evaluating your potential entries for today as an example…and you want
to only invest in a down volatility day…do you only look at the direction of the volatility line from the previous candle or do you also look forward to the direction of the volatility line to the next candle?

Yes do it’s must.

Sorry, but what do you mean by “Volatility Line”. Are you referring to Bollinger Bands?