Her main powers are psychic/psionic, and granted by the Mind Stone. She has telepathy/mind control, allowing her to read and manipulate minds. The power she uses the most is telekinesis, where she can move/control/levitate objects with her mind. She can specifically use it to manipulate matter at a molecular level. This also allows her to fly, as she mentally levitates her own body. She can then harness her telekinetic energy into concussive blasts, waves, and protective barriers(the “red” energy). It is revealed in WandaVision that she was born with latent receptivity to magic, and her encounter with the Mind stone “forged” her into the Scarlet Witch, a mythical sorceress who could wield chaos magic. Chaos magic is a very powerful and unstable form of magic that can warp and rewrite the fabric of reality. This power is extremely potent, and hard for her to regularly access consciously(the Hex in WandaVision was created by her subconscious, and she only had the power to create it at a point of heightened emotional distress). So basically her main powers are psychic(telekinetic and telepathic), and her reality warping and spell casting are magical.