The first ten days of dhul hijjah

 The first ten days of dhul hijjah

Alhamdulillah, the first ten days of dhul hijjah is the best days among all days in the year.

As reported,

Narrated Ibn `Abbas:

The Prophet (ﷺ) said, "No good deeds done on other days are superior to those done on these (first ten days of Dhul Hijja)." Then some companionsof the Prophet (ﷺ) said, "Not even Jihad?" He replied, "Not even Jihad, except that of a man who does it by putting himself and his property in danger (for Allah's sake) and does not return with any of those things."

Sahih al-Bukhari 969.

It is recommended to do a lot of good deeds during the first ten days of dhul hijjah like reciting Quran, praying a lot of nawafil, making the adkhar saying,

Subhan Allah, Alhamdulillah, Allahu Akbar, laa ilaha illa Allah,

Making alot of istighfar. One can also fast in these days and do a lot of charity and swadaqah.