I am interested in web development so do I need chocolatey or not, what's most important is that I saw a comment on one website telling me that installing node js will update my windows version to the latest version, is that true because I don't want to update.
Chocolatey is a Windows Package Manager, it manages packages.
https://docs.chocolatey.org/en-us/#what-is-chocolatey
You don't need Chocolatey in order to do web development. Having Chocolatey makes the automated installation and updating of the applications on your machine easier.
By itself, Chocolatey doesn't do anything with regard to updating the underlying operating system. I believe that you may be referring to an issue with a version of Node which included a Boxstarter script, which installed a number of Chocolatey packages, which also had the side effect of performing a series of Windows Updates during the installation. This was an unfortunate situation, but I believe it has been resolved.