Celtic Deities Resources?

Hi all, wonderful to be part of this board.

I’ve been reading through some books on Celtic mythology – I’m far from being well informed on the topic yet, so bear with me!
I’ve noticed that the gods and goddesses I’ve heard a lot about don’t tend to turn up that much in the myths I’ve read. A lot of what seems to have gotten through the ages have been folk tales and hero stories.
Why is that? Is it because the mythology was filtered through a Christian culture by time they were written down? And if so, can anyone recommend some books for me to come to understand the Celtic gods? I’ve looked through some of the reading lists pinned here, but maybe I’ve missed something.

I’m currently working through Orr’s Principles of Druidry and Ellis’ Mammoth Book of Myths and Legends.

Thank you for your time!

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