The first ten days of Dhul Hijjah are in fact the most sacred days of the year.
There is an explicit Prophetic tradition narrated by Jabir ibn Abdullah in which the Prophet ﷺ said, “The best days of this world are the ten days (meaning the ten days of Dhu’l-Hijjah).”
By giving your zakah and sedekah during Dhul Hijjah you will also benefit and reap the rewards of this blessed month.
During the month of Dhul Hijah, Muslims around the world also donate korban which is an obligatory act where an animal is slaughtered. This act is performed for us to reflect on Prophet Ibrahim’s (AS) willingness to sacrifice his son Ismail for the pleasure of Allah.
Generally speaking, any act that Allah SWT is pleased with should be done in these days. The primary act to be done abundantly is the tahleel, takbeer and tahmeed as these were the first to be mentioned in the narration Ibn ‘Umar RA where the Prophet ﷺ said, “There are no days that are greater before Allah or in which good deeds are more beloved to Him, than these ten days, so recite a great deal of tahleel (saying Laa ilaaha ill-Allah), takbeer (saying Allahu akbar) and tahmeed (saying al-hamdu Lillah) during them.”