What are the ways to be protected from the Dajjal, and what are the supplications or Quranic recitations that are beneficial for that?

The Prophet (PBUH) guided his Ummah to that which would protect it from the tribulation of the Dajjal, and among those are:

Adhering to Islam and the weapon of Tawhid (definition) (monotheism), and knowing Allah by His names and attributes, so that one may know that the Dajjal is a human being and his claim to divinity is false. Seeking refuge with Allah from his tribulation, especially in prayer. The Messenger of Allah (PBUH) used to supplicate: "O Allah, I seek refuge with You from the punishment of the grave, and I seek refuge with You from the tribulation of the Masih ad-Dajjal." Memorizing ten verses from the beginning of Surah (definition) Al-Kahf or its end. The Prophet (PBUH) said: "Whoever memorizes ten verses from the beginning of Surah Al-Kahf will be protected from the Dajjal." Fleeing from the Dajjal and keeping away from him, because of the extraordinary feats and doubts he possesses. The Prophet (PBUH) said: "Whoever hears of the Dajjal, let him keep away from him. For by Allah, a man will come to him, thinking he is a believer, and will follow him because of the doubts he presents."