There is so much context left out of most answers here except for @rikAo and @constantinfrompluto. The easy answer is that OpenGL is still the way to go for cross platform GPU programming and it is performant enough except for really extreme stuff. Not the things you do initially anyway. If you bonk your head against a performance wall, then it might be time to switch API. If you are a Mac/iOS person and don't care about the world outside of Apple for the time being Metal is also a solid choice. For your own sanity stay away from Vulkan for now.