Personally, JavaScript would be my recommendation. Python is also a good one with a shallow learning curve too, but the reason I'd choose JavaScript is because you have such a low amount of effort to start: any modern web browser can run it if placed inside a simple HTML page. The language is also transferable to the backend (server) with NodeJS once you're comfortable with it, since that's JavaScript, too. And even mobile and desktop apps can be produced with React Native and Electron respectively. Based on these pros, and without knowing more about what you really want to program for, JavaScript is the easiest these days to apply to just about any platform. Though ultimately: don't let the choice of language hold you back too much, programming in any language will build up transferable programming skills that can be applied to other languages later!