Why Did Pterosaurs Have Head Crests?

One of the most recognisable Features of pterosaurs was their huge crest that would have dominated their silhouette on the mesozoic skyline. In particular the incredibly famous backward cone shaped crest of pteranodon. Many theories have been put forward for why these structures existed from the outlandish to the mundane, so what was there purpose?

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Sources:
https://www.researchgate.net/publication/229502318_Aerodynamic_Characteristics_of_the_Crest_with_Membrane_Attachment_on_Cretaceous_Pterodactyloid_Nyctosaurus

https://www.researchgate.net/publication/324607477_New_Information_on_the_osteology_and_a_taxonomic_revision_of_The_genus_Thalassodromeus_Pterodactyloidea_Tapejaridae_Thalassodrominae

https://www.researchgate.net/figure/Sexual-dimorphism-in-pterosaurs-a-Female-specimen-of-the-pterosaur-Darwinopterus_fig2_230810113

https://onlinelibrary.wiley.com/doi/10.1111/j.1502-3931.2011.00300.x

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