What's the difference between この and これ?
I'm using the デスノート manga to help get into reading as I learn Japanese. There's a sentence that goes like this: このよはくさってる, meaning this world is rotten, and I realized I could use the same structure to make sentences like: このたべものはくさってる. But, I don't understand what the difference is with just using これ, or この. Thanks in advance for the help! ありがとうございます！

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In short, この works as adjective and これ works as pronoun as well as その/それ, あの/あれ.

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みなさんありがとうございます！

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これは本（ほん）です。 This is a book.
それ／あれは本です。That is a book.

この本はとても面白い（おもしろい）です。This book is very interesting.
その／あの本はとても面白いです。That book is very interesting.

This is how it works.