This is an app made following the 'React / GraphQL Course - Build a social media app (MERNG Stack)' Made by freeCodeCamp.org. https://www.youtube.com/watch?v=n1mdAPFq2Os&t=18601s
The following will use : MERN tech stack with an addition of GraphQL.
Short 100 second video made by Fireship explains what GraphQL does better than I would be able to describe. https://www.youtube.com/watch?v=eIQh02xuVw4