Sysaux tablespace is full. Can it be purged

We have a sysaux tablespace that is full and cannot extend. I've searched the forums but do not fully understand the solutions:

1) Can the *.bin files resulting in the overflow be deleted with an impact on the database.

2) Can someone help with understanding what needs to be done to first clear out the unified_audit_trail then limit the future growth?

I'm not a DBA, but trying to understand the documentation that I have found and am hesitant to try something without clarity.

Thank you for any help I can get.