Notes.txt

Nodemon use because of hot reloding concept . 
If file save so automatically restart the server , 
so ye pta bhi nhi lgta jo code likha hai wo sb processs hokr code me show hone lga .

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How upload images or videos 

first upload images through multer , then these imagaes we will store into our local files 
(where anything i want to upload so these are saved on this files)

then while uploading any images on cloudinary , this will fetch from our local images files 

This is because , i give one more change to upload .
This is 2 step Process

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Middleware has 4 parameters -> (err , req , res , next)

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mongoose-aggregate-paginate-v2 -> This library allow to write mongodb aggration pipeline

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JWT Token is something like Bearer Token , means jo usko bear krta hai , mai usko ek authenticate or sahi person maan lunga

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URL -> Uniform Resouce Locator
URI -> Uniform Resouce Identifier 
URN -> Uniform Resouce Name