From Ligonier Ministries, a classic teaching series from Dr Sproul:
The Holiness of God
“The Holiness of God examines the meaning of holiness and why people are both fascinated and terrified by a holy God. This series closely explores God’s character, leading to new insights on sin, justice, and grace.” (from the Ligonier website)
Also currently available for free is ‘What is Reformed Theology‘.
Dr Sproul has extensive knowledge of church history and modern church ‘culture’, which is very informative even for those who differ with him in some theological areas, as I do.