I hope Airborne collectors on here may add comments - but to get the ball rolling:
Google is a good resource. Also this site which you should fully explore:
https://www.paradata.org.uk/unit/44t...borne-division
If you are just starting out - watch for the pitfalls, it is a minefield out there - particularly with Airborne and other desirable areas of collecting - loads of fakes unfortunately. But that is a subject for Airborne specialists ...