Satan and the Gods are extraterrestrials. This means they come from other planets. They have reached levels of great spiritual advancement. This is not something absurd: also human beings themselves can advance and anyone who has tried to practice spirituality in a constant and continuous manner over time knows how concrete it is.
Satan and the Gods are very advanced and have reached high spiritual levels, Divine Condition, physical immortality, etc. Satan gives this gift to his children, he gives them the ability to achieve these same things. But Satan has already achieved this.
This is why Satanas and his Demons were Teachers of humanity. They taught great spiritual knowledge through allegorical mythologies and more. There are many stories featuring our Demons. Zeus for example (i.e. Beelzebul) was the protagonist of many allegorical stories which were actually teachings to be understood in a spiritual and not literal way.
They are very powerful deities, obviously it has nothing to do with the imaginary Christian omnipotence where the invisible fantasy characters snap their fingers two or three times and create multiverses. But our Gods are truly very powerful and understanding their essences and what they represent can be difficult. So very difficult that some Gods have multiple names also among the same population. For example, the Demon Astarte is known in Greece as Aphrodite, Athena, Artemis, and so on.
To say exclusively that they are powerful is also an understatement. Our Gods are literally perfect beings. Wisdom, intelligence, knowledge, awareness, ethics... a Demon is truly accomplished, has no flaw, is the best guide one can have and I am sure that everyone should seek the guidance of their Guardian Demon (to give an example).
Stay close to the Gods. About Angels and stuff, that's just Jewish crap. Stay away from these nasty things. They are not made for Gentiles (i.e. non-Jews), they just turn out to be curses for Gentiles. There is not a single time that a Gentile has reported non-traumatic experiences with an Angel. Don't focus on that, focus on the Gods and the greatness of the Gods. Fill yourself with the positivity of Satanism, not angelic garbage.
However, your curiosity is very positive, sincere congratulations on your studies! Keep going!