The version number indicates that you are likely looking for one of two things:
Before 5.0, making a metallic sword look like metal and a rubber tire look like rubber required complex, custom shader coding. With 5.0.0f4, Unity introduced a Standard Shader. You dragged in your textures, slid a "Metallic" slider, and it just worked. unity 5.0.0f4
Why does "f4" matter? The initial Unity 5.0.0 releases were notoriously unstable. Here are the game-breaking issues that Unity 5.0.0f4 resolved: The version number indicates that you are likely
Games started in this version defined the next era. It was the engine used for Kerbal Space Program's 1.0 push, it powered Cities: Skylines, and it was the foundation for Ori and the Blind Forest (though they used a heavily customized version). The "f4" Difference: Critical Bug Fixes Why does
Unity 5.0.0f4: A New Era for Unity Development (2015 Lookback)