LG G4 :: Correct Way To Setup Contacts

Ok this may sound simple but I'm coming from an apple device that had much less options. Whats is the correct way to do this? In porting over my contacts somehow i ended up using Microsoft exchange server and it created a hell of a lot of multiple contacts for the same person but based on different emails,phone numbers... You name it. Not sure how i did that. Some if my contacts have multiple listings for the same field when i go to edit them, I'm not sure which field i should be entering thier correct data.

For instance, if i add new contact, that contact can be either

Phone contact
Google contact
Microsoft exchange contact
SIM contact

Some of my contacts when clicked on have two phone accounts associated with them. When i click edit, i scroll through the usual name, phone number etc... then I'm presented with another Phone contact heading with the same fields again only might have a different email address in one of the fields.