Finance expert to explain every different type of loan

Looking for a financial specialist that can discuss all different types of loans available to consumers. What are they and when would they come in handy? Are there preferred ones vs. ones that should be avoided? What are fixed-rate vs. variable rate loans? What’s the difference between secured and unsecured? What’s open-ended vs. close-ended loans? Can you specify which loans are classified in what bucket (ex: where does a student loan or car loan fall into?)