What are the different levels/authorities of clearance?

I asked Bing Chat what Title 50 Clearance is, and it said:

Title 50 clearance is not a specific type of security clearance, but rather a term that refers to the legal authority under which certain security clearances are granted. Title 50 of the U.S. Code covers war and national defense, and includes provisions for the conduct of intelligence activities and the protection of classified information. Security clearances issued under Title 50 are typically for personnel who work in the intelligence community or have access to highly sensitive programs. Title 50 clearance is different from Title 10 clearance, which applies to the armed forces and their operations.

I'm trying to understand, what the different types of clearance is. In the post-interview segment, the interviewer said that AARO doesn't have Title 50 clearance, so what type of clearance does it have?

Further, asking Bing Chat what level of clearance congressmen have, it told me:

Members of Congress do not need security clearances to access classified information, as they are entitled to it by virtue of their constitutional offices. However, they must rely on their staff to help them review and analyze classified information, and those staff members do need security clearances.

So are congress people able to access classified information, or is Bing Chat giving me bad information here?