Is Da‘wah required of a Muslim only after acquiring enough knowledge? May Allaah reward you well.

All perfect praise be to Allaah, the Lord of the worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and messenger.

It is the duty of all Muslims to invite people to follow the teachings of Islam. The Prophet, sallallaahu ‘alayhi wa sallam, ordered us to convey part of what he, sallallaahu ‘alayhi wa sallam, brought forth, even if that was just one verse from the Quran. [Al-Bukhari]

However, to shoulder the mission of inviting to the path of Allaah, you must have sufficient knowledge about what you are presenting. Allaah Says (what means): {Say, "This is my way; I invite to Allaah with insight, I and those who follow me. And Exalted is Allaah; and I am not of those who associate others with Him."}[Quran 12:108]

This does not mean that a Muslim should not invite people to the path of Allaah until he knows everything about Islam. Rather, he should convey every religious matter or ruling (supported with evidences from the Quran and authentic Sunnah) that he learns to other Muslims, or to those who need to be aware of it through Da‘wah.

May Allaah The Almighty bless you and make you beneficial to all Muslims.

Allaah Knows best.