Some people need proof when they are told new things that are different from what they believe currently. For example, people that used to work with Windows might argued that Linux is hard to use when their friends told them that Linux is very easy to work.
If you need some proof why Linux is better, then please visit this site : Why Linux is Better. It listed some reason why Linux can be said better than Windows from several perspective. Nevertheless, Linux is not for everybody, so this site also gives you some cases where you should stick with Windows (for now, but hopefully it will be changed in the future).
This site has translations project, but unfortunately Indonesian language is not among them. Anybody is interested on translating this website?