hello world! I wanted some guru advice on my case. I will be finishing my CS degree soon. At this point when i see what i know about programming languages, I don't have enough knowledge. this makes me wonder what the heck learned at school lol. I know algorithms / data structures and I can code in java, c, c#, f sharp but these are not popular anymore. i see that i will have to learn more languages myself. So i moved to sites like udacity / coursera etc and they have some really interesting courses. there is a course on coursera for website development with nodeJs that is free to audit. my question is, if i learn the skill, will a class completion certificate matter? i mean, i can learn Js frameworks, NodeJs, Html, css, ruby on rails etc without spending a dime lol but only effort. is it worth it? or should i go buy these courses?