The cult of Lord Caitanya Mahāprabhu is bhāgavata-dharma, and He especially recommends kṛṣṇa-kathā, or the cult of Bhagavad-gītā and Śrīmad-Bhāgavatam. He recommends that every Indian, considering this task to be para-upakāra, or welfare activity, take the Lord's message to other residents of the world. "Other residents of the world" does not refer only to those who are exactly like the Indian brāhmaṇas and kṣatriyas, or like the caste brāhmaṇas, who claim to be brāhmaṇas because they were born in the families of brāhmaṇas. The principle that only Indians and Hindus should be brought into the Vaiṣṇava cult is a mistaken idea. There should be propaganda to bring everyone to the Vaiṣṇava cult. The Kṛṣṇa consciousness movement is meant for this purpose.
(Srimad Bhagavatam----4:8:54----purport).

Lord Caitanya Mahāprabhu wanted His followers to move all over the world to preach in every town and village. In the Caitanya-sampradāya those who strictly follow the principles of Lord Caitanya must travel all over the world to preach the message of Lord Caitanya, which is the same as preaching the words of Kṛṣṇa—Bhagavad-gītā—and Śrīmad-Bhāgavatam. The more the devotees preach the principles of kṛṣṇa-kathā, the more people throughout the world will benefit.
(Srimad Bhagavatam----4:30:37----purport).

Bhāgavata-dharma and kṛṣṇa-kathā are identical. Śrī Caitanya Mahāprabhu wanted everyone to become a guru and preach the instructions of Kṛṣṇa everywhere from Bhagavad-gītā, Śrīmad-Bhāgavatam, the Purāṇas, Vedānta-sūtra and similar Vedic literatures. Āryans, who are advanced in civilization, follow bhāgavata-dharma. Prahlāda Mahārāja, although merely a child of five years, recommended:
kaumāra ācaret prājño
dharmān bhāgavatān iha
durlabhaṁ mānuṣaṁ janma
tad apy adhruvam arthadam
(S.B.7:6:1)
Prahlāda Mahārāja preached bhāgavata-dharma among his classmates as soon as an opportunity was afforded by the absence of his teachers from the classroom. He said that from the very beginning of life, from the age of five, children should be instructed about bhāgavata-dharma because the human form of life, which is very rarely obtained, is meant for understanding this subject.
(Srimad Bhagavatam----6:16:43----purport).

Whenever there is an opportunity to hear about the transcendental activities of the Lord, we must take it. Śrī Caitanya Mahāprabhu recommends, kīrtanīyaḥ sadā hariḥ: (CC.1:17:31) one should always engage in kṛṣṇa-kathā by chanting and talking about Kṛṣṇa and hearing about Him. That is the only occupation of a Kṛṣṇa conscious person.
(Srimad Bhagavatam----7:1:4-5----purport).

The Lord also says in Bhagavad-gītā (7.1), asaṁśayaṁ samagraṁ māṁ yathā jñāsyasi tac chṛṇu. In other words, if one wants to understand the Supreme Personality of Godhead in completeness, one must follow the prescriptions given by Kṛṣṇa by following in the footsteps of Mahārāja Ambarīṣa. It is said, hṛṣīkeṇa hṛṣīkeśa-sevanaṁ bhaktir ucyate: (CC.2:19:170) bhakti means to engage the senses in the service of the master of the senses, Kṛṣṇa, who is called Hṛṣīkeśa or Acyuta. These words are used in these verses. Acyuta-sat-kathodaye, hṛṣīkeśa-padābhivandane. The words Acyuta and Hṛṣīkeśa are also used in Bhagavad-gītā. Bhagavad-gītā is kṛṣṇa-kathā spoken directly by Kṛṣṇa, and Śrīmad-Bhāgavatam is also kṛṣṇa-kathā because everything described in the Bhāgavatam is in relationship with Kṛṣṇa.
(Srimad Bhagavatam----9:4:18-20----purport).