On your blog there is somewhere the line "My ~/project folder is full of half finished web apps ...". The knowledge of some computer languages alone isn't usef

On your blog there is somewhere the line "My ~/project folder is full of half finished web apps ...". The knowledge of some computer languages alone isn't useful if you don't apply this knowledge somewhere. For example building stuff. But building something requires more then just knowledge of languages. So without those other knowledge your computer language experience is rather worthless for you. Also you can't really evaluate the dis-/advantages of a language when you never ship something. If you just want to automate some private stuff the above isn't true of course, but then Python and JS is sufficient anyway.