I found your answer @anonymous_user_270a0ed8
Please see this link. It explains the connector colors as based on the pin colors.
https://docs.unrealengine.com/en-US/Engine/Blueprints/UserGuide/Nodes/#datapins
- Dark Red – Binary
- Aqua Green – Integer
- Yellow-Green – Float
- Magenta – String
- Orange – Transform
- Yellow – Vector
- Dark Blue – Linear Color
- Sky Blue – Rotator
Generally though… I’m sorry it took so long for someone to get this answer to you. I’m an Unreal noob and needed this information. A two year wait on an answer, for one of the most popular pieces of software in the whole world, is ridiculous. This lack of documentation is endemic though of Unreal and is a great hindrance to new developers.