There are a number of ways to get started with .NET. Because .NET is a massive platform, there are multiple articles in this documentation which show how you can get started with .NET, each from a different perspective.
Get started using .NET languages
The C# Getting Started articles and C# Tutorials provide a number of ways to get started in a C#-centric way.
The F# Getting Started tutorials provide three primary ways you can use F#: with Visual Studio, Visual Studio Code, or command-line tools.
The Visual Basic Getting Started articles provide guides for using Visual Basic in Visual Studio.
Get started using .NET Core
Getting Started with .NET Core provides an overview of articles which show how to get started with .NET Core on different operating systems and using different tools.
The .NET Core Tutorials detail a number of ways you can get started with .NET Core using your operating system and tooling of choice.
Get started using Docker on .NET Framework
Docker on .NET Framework shows how you can use .NET Framework on Windows Docker containers.