And the tl;dr of the Astral Dimension is that it is an alternate dimension that is also referred to as the "Spirit World". All matter there is made of ectoplasm and people can use this to channel energy into their bodies (basically turn their limbs into weapons). While Strange can push his Astral form aka his spirit out of his body and interact with others within that dimension he can also interact with others in the real world/physical world. But, as shown in the film, his astral form is limited in the real world and holds more power in the Astral dimension.
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And the tl;dr of the Astral Dimension is that it is an alternate dimension that is also referred to as the "Spirit World". All matter there is made of ectoplasm and people can use this to channel energy into their bodies (basically turn their limbs into weapons). While Strange can push his Astral form aka his spirit out of his body and interact with others within that dimension he can also interact with others in the real world/physical world. But, as shown in the film, his astral form is limited in the real world and holds more power in the Astral dimension.
Bonus: 1 2
I hope that helps!