It’s the first ten of dhul-hijja so these are reminders for me before anybody else.
1) The Prophet (peace and blessings of Allaah be upon him) said: “There are no days in which good deeds are more beloved to Allaah than these ten days.” They said: O Messenger of Allaah, not even jihad for the sake of Allaah? The Messenger of Allaah (peace and blessings of Allaah be upon him) said: “Not even jihad for the sake of Allaah, unless a man goes out with his self and his wealth and comes back with neither.” Narrated by al-Bukhaari (969) and al-Tirmidhi (757), from the hadeeth of Ibn ‘Abbaas (may Allaah be pleased with him).
2)The Messenger of Allaah (peace and blessings of Allaah be upon him) was asked about fasting on the day of ‘Arafah and he said: “It expiates for the past and coming years.” Narrated by Muslim (1162). According to another report: “I ask Allaah that it may expiate for (the sins of) the year that comes before it and the year that comes after it.”
3) It is Sunnah to recite takbeer (saying Allaahu akbar (Allaah is most great)), tahmeed (saying al-hamdu Lillah (praise be to Allaah)), tahleel (saying Laa ilaaha ill-Allaah (There is no god but Allaah)) and tasbeeh (saying Subhaan-Allaah (Glory be to Allaah))
English translation from Islamqa