Wonder how this opinion will age. Won't be surprised if in 10 years OpenGL will be more widely supported and used than Vulkan. It's the Lindy effect after all.
All I can say for certain is that 10 years from now there will great OpenGL-to-VulcanMetalWhatever translators, at least as good as the ones already built-in to several graphics stacks today, and the learnopengl.com tutorial and examples will still work. So unless you actually intend to compete with AAA game engine designers, you may safely invest your time in OpenGL.
All I can say for certain is that 10 years from now there will great OpenGL-to-VulcanMetalWhatever translators, at least as good as the ones already built-in to several graphics stacks today, and the learnopengl.com tutorial and examples will still work. So unless you actually intend to compete with AAA game engine designers, you may safely invest your time in OpenGL.