The Council of the EU
Where national governments negotiate — the Council of the EU, European Council, and how member states shape EU decisions.
Two Councils (Yes, It's Confusing)
The EU has two bodies with 'Council' in the name, and they are frequently confused:
The European Council is the gathering of heads of state and government (e.g., the French President, the German Chancellor). It sets the EU's overall political direction and priorities. It meets at least four times a year and is chaired by a permanent president (currently António Costa).
The Council of the EU (also called the Council of Ministers) is where national government ministers meet to negotiate and adopt legislation. Its composition changes depending on the topic — finance ministers for economic issues, foreign ministers for foreign policy, etc.
There is also the Council of Europe, which is not an EU institution at all — it's a separate organization focused on human rights with 46 members.