Conditional Fields

Most of the items listed look like they're not in use. Content and Paragraph seem like the places where conditions are used.

Field	Description
Custom Block	Is this in use?
Content Moderation State	Is this in use?
Crop	Is this in use?
Fake Entity Type	Is this in use?
Subscription	Is this in use?
Feed	Is this in use?
File	Is this in use?
Flagging	Is this in use?
Media	Is this in use?
Custom Menu Link	Is this in use?
Message	Is this in use?
Content	Used in Event, Home Page Slide, Job Posting, and Resource. Need info on how these work / what the do.
URL Alias	Is this in use?
Redirect	Is this in use?
Search Task	Is this in use?
Taxonomy Term	Is this in use?
Custom Token	Is this in use?
User	Is this in use?
Webform Submission	Is this in use?
Paragraph > Helpful Link	Is this only used for Helpful Link? Need info on how this one works / what it does.