how many ways of communication are there to communicate with spirits, succubus, high beings?

Pendulum, Tarot, runes, dreams, clairaudience, clairsentience, “signs”, Ouija boards.

I’m sure I have missed a few.

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Telepathy as well

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Also water, smoke, fire (probably falls within the lines of @Veil’s suggestion of “signs”.

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Likely also a sub-group of Veil’s topics, but you can use Pathworking to bring about visions.

I’ve heard Astral projection as well can be used, though the definition of whether or not “astral projection” connects to real spirits or the imagination depends on which practitioner you speak to.