Monism attributes oneness or singleness (Greek: μόνος) to a concept e.g., existence. Various kinds of monism can be distinguished: Priority monism states that all existing things go back to a source that is distinct from them; e.g., in Neoplatonism everything is derived from The One. In this view, only one thing is ontologically basic or prior to everything else. Existence monism posits that strictly speaking, there exists only a single thing, the Universe, which can only be artificially and arbitrarily divided into many things. Substance monism asserts that a variety of existing things can be explained in terms of a single reality or substance. Substance monism posits that only one kind of stuff exists, although many things may be made up of this stuff, e.g., matter or mind. Learn more at https://en.wikipedia.org/wiki/Monism

Monism

Monism attributes oneness or singleness (Greek: μόνος) to a concept e.g., existence. Various kinds of monism can be distinguished:

Priority monism states that all existing things go back to a source that is distinct from them; e.g., in Neoplatonism everything is derived from The One. In this view, only one thing is ontologically basic or prior to everything else.
Existence monism posits that strictly speaking, there exists only a single thing, the Universe, which can only be artificially and arbitrarily divided into many things.
Substance monism asserts that a variety of existing things can be explained in terms of a single reality or substance. Substance monism posits that only one kind of stuff exists, although many things may be made up of this stuff, e.g., matter or mind.

Learn more at https://en.wikipedia.org/wiki/Monism