What is its meaning
Hanukkah commemorates the victory of the Maccabees over the Syrian-Greek army, according to the My Jewish Learning website. The subsequent miracle of recovering the Sacred Temple and restoring its Menorah (candelabrum) is also remembered.
Why candles are lit
According to tradition, after recovering the Temple of Jerusalem, the Jews wanted to light the sacred Menorah, but they lacked the oil they should use. Miraculously, they discovered a jar of special oil, which allowed to light it for eight days and eight nights, until more oil was prepared, indicated in USA Today.
And how they turn on
To celebrate the festival and commemorate the miracle, the Jews light their own candlesticks. There is a specific way to do it, as indicated in the Chabad portal. The first night, a candle should be fixed at the far right of the Menorah. The next night, a second candle is added to the left of the first. Then continue adding a candle every night of Hannukah.
To light them, first light the Shamash, which is the pilot candle that goes in the center, and use it to light the others. Each night, a new candle is lit first (at the far left) and continued from left to right.
That is, the candles are placed from right to left and turn in the opposite direction.
What you eat
The miracle of the oil found is not only commemorated with candles, according to USA Today. It is also customary to serve foods prepared with oil, including latkes (potato pancakes) and sufjaniot (donuts).
On the whirligig
Sevivón in Hebrew and dréidel in Idish, that object serves to remember the time in which the Hellenic soldiers watched that the children did not study Torah, is explained in Chabad. Those who did not comply with that order, disguised before the soldiers playing with a whirligig.