The internet is full of Hello World examples, there is an abundance of documentation and example projects on GitHub, thousands of development blogs/networks like dev.to and you can learn anything from YouTube.

On the other side of the spectrum there are online courses on sites like udemy that you do pay for. These platforms hand out a certificate when you completed a course. You can also buy books and/or ebooks.

Do you pay for knowledge? Do you ever buy (e)books or spend money on a course? Was this a good investment or did you waste your money? What makes/made you decide to give it a try? Do you recommend it to others? What is your story?

Thanks.