Currently i'm working on project that's built into umbraco cms, now i want to add some functionality like add custom fields using umbraco so is there any way to add custom fields into project using umbraco ?
e.g. i have fields named "text,imageURL and name" now i want to save and (loop)fetch into particular div tag in razor view.
i'd followed this link 'https://www.youtube.com/watch?v=0PtzyrEFG7I'
Is this what you're looking for? https://our.umbraco.org/documentation/Getting-Started/Data/Defining-content/
Content fields in Umbraco are called properties, and you define properties per document type - it's very easy to do via the backoffice as you'll see in the link.
The Youtube video you've found is for much more advanced scenarios than I think you're after.