There isn't just one language that is most common, it really depends on what type of game development you are looking into doing. But, some of the more popular languages that you can make games in are:
C# while using Unity
C++ while using Unreal Engine
Godot can use C# or C++
Java is always an option
Really the hard part is picking the language you like the most to make a game with. There are several factors that lead people to choose one such as:
- Easy of learning the language
- Quirks or features of the language
- What type of game are you making
- Where will it be distributed and hosted
- Do you like the interface that the language uses
- Does this language meet all your needs to make the game
But, to give you a simple answer, usually the bigger game studio's and console games tend to be written in either C++ or C#
Hope this help,
C# is popularly used in many game engines today and is one of the most popular languages required for game development.
Lua has a simple language structure and syntax and is becoming one of the most popular languages for the gaming industry. It is a multi-platform scripting language a vast number of modern game engines utilise Lua as their primary game design programming language.
You may learn Construct Game Engine, or Godot Engine, Blender, Stencyl and Buildbox as a beginner without programming experience.
Visual Studio supports many scripting languages in Windows MacOS Linux or Cloud or mobile, depending if you choose Visual Studio IDE or Visual Studio Code.
It will be good to enroll in a Coding class while using other online learning sources like codecademy.com to learn.