I've personally used a lot of different programming languages in my time. Java, Ruby and SQL are up there in my favourites. I don't really mind HTML, CSS and Javascript as I learned them from an early age so they're relatively easy for me. Rust is also a good contender, I've thoroughly enjoyed using it. Honestly, I'm fine with any language as long as it's not C#. I don't hate C#, but C# hates me.