Can you please give me a list of all ecumenical councils and summarize what the core issues that needed to be discussed that time and what was decided at each of them
Sure, here is a list of all the ecumenical councils recognized by the Catholic, Orthodox, and Anglican churches, along with a brief summary of their core issues and decisions:

1. First Council of Nicaea (325) - The issue of Arianism, the belief that Jesus was not fully divine, was addressed. The council declared that Jesus was of the same substance as God the Father (homoousios), and established the Nicene Creed.
2. First Council of Constantinople (381) - The issue of the divinity of the Holy Spirit was addressed. The council affirmed the Nicene Creed and added language about the Holy Spirit.
3. Council of Ephesus (431) - The issue of Nestorianism, the belief that Christ had two distinct natures (one divine, one human), was addressed. The council declared that Christ was one person with two natures, and established the title Theotokos for Mary, meaning God-bearer.
4. Council of Chalcedon (451) - The issue of Monophysitism, the belief that Christ had only one nature (divine), was addressed. The council declared that Christ had two natures (divine and human) in one person, and established the Chalcedonian Creed.
5. Second Council of Constantinople (553) - The issue of the nature of Christ's wills (divine and human) was addressed. The council affirmed the teachings of the previous councils on Christ's nature, and condemned certain writings of Theodore of Mopsuestia.
6. Third Council of Constantinople (680-681) - The issue of Monothelitism, the belief that Christ had only one will (divine), was addressed. The council declared that Christ had two wills (divine and human) in one person.
7. Second Council of Nicaea (787) - The issue of iconoclasm, the belief that the use of religious images was idolatrous, was addressed. The council declared that the veneration of icons was acceptable, as long as it was not worship.

These are the seven ecumenical councils recognized by the Catholic, Orthodox, and Anglican churches. It should be noted that the Protestant churches generally only recognize the first four councils as ecumenical.
expound on the protestant churches reasoning