How to fetch user details with user "(username,email)and opportunity(id,stagename) object fields based on username by using JSON 

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I want to disable personalize nav bar options for users.

Hi,  i see mixed answers all over the web regarding what is required for a SOAP Login authentication.  Some answers are Username and password and Security Token while others are saying Username and Password and Organization Id.

I think I am getting it as username and password are the only thing required and security token is optional depending on network ip settings
For communities it would be username and password and Organization id.

Can someon help me understand what is exactly required?

I want to disable personalize nav bar options for users.