Parts of a candle
Body = distance between open and close. Wick = the extremes reached during the period. A long lower wick means sellers pushed price down but buyers reclaimed it.
What to notice
Big body, tiny wicks = strong conviction. Long wick against the trend = rejection. Doji (no body) = indecision at that price.
Context is everything
The same candle at support means something totally different than at resistance. Read the location first, then the candle.