Shub niggurath and black goat

Is shub niggurath and the black goat the same ?
How to invoke/pray/meditate to them ?

Yes. Shub-Niggurath | The H.P. Lovecraft Wiki | Fandom

Same as any other entity. These things are not specific to any being.

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Has several sigils and is one of the main deities in covens working with the Great Old Ones. The system works with them assigned to a day of the week. Shub Niggurath is worshiped Fridays, related to Venus and Sex Magick, Glamour Magick but also Bane and vampyric workings.