Jamaat refers to the congregational prayer.

Ibadah means worship, examples for worship are: salat (five times prayer), zakat (Obligatory Charity), ziker (remembrance of Allah), and sawm (fasting).

For questions about the Islamic belief system, e.g. the afterlife, predestination, angels. Can be used in conjunction with denomination tags to limit the scope.

ردة disbelief or renouncing of Islam by a Muslim.

What you belief in, And as a Muslim you have to belief in God, his Angels, his Messengers, his Holy Books, in the Last Day and in Al-Qadar (Pre-Ordainment)

Sufism is an ideological movement that originated as a means for purification of ones soul. There are many different groups each group has different rulings. Some drink wine, others use musical instruments, while others are actually Zuhad. Many groups practice innovations which was unknown to the Prophet's time, while others who are called Sufi use the spiritual exercises found in the pure Sunnah.