Consume Web API in .NET 5 Core MVC-Downlaod Source Code

I am building .net 5 core with mvc application in which i need to access third party API in an .NET Core RestClient makes the call to the 3rd party Web API.I will adress this type of question like as how to call third party rest api in c#?how to call external api in c#?how to call third party api in web api?how to call third party api in .net core ussing RestSharp?how to use third party api using RestSharp?Consuming third-party APIs in ASP.NET Core.