Imaam Ahmad ibn Hanbal, the Imaam of the ahl us sunnah wal jamaa’ah, died in 241AH. His Usoolus Sunnah is a very short outline of the basics of the ‘Aqeedah (creed and belief) of the people of the Sunnah,  those issues on which they are in unanimous agreement.
Usool us Sunnah STUDY GUIDE (MCQs)   !*!*!*!SHORT STUDY GUIDE!*!*!*!
9 sessions lasting 45 minutes each. Basic level for people who have been Muslims for some time. MCQ style questions do not just test what you know but also your ability to spot errors. Additional translations from the scholars from various books aid understanding.
Written by Umm Zaynab Aalia bint Ehsanullah and checked by Aboo Talhah Dawood Burbank.
[A correction has been made to Point 3 Question 12. Taraaweeh prayer in congregation is not an innovation.]
(Taken from:

Usool us Sunnah

The Foundations of the Sunnah by Imaam Ahmad.