What's the modern peer review process for science? Is there an open forum filled with reputed researchers who are willing to write their reviews, ask questions

What's the modern peer review process for science? Is there an open forum filled with reputed researchers who are willing to write their reviews, ask questions or give suggestions to young researchers who are submitting their work for review in a well-formed format? And is there a role for other bystanders who are observers out of curiosity and may be inspired to become scientific researchers or reviewers themselves? In this age of Internet, isn't this kind of online collaborative open forum going to scale much better? Why are these age old print journals still in charge of this process with print era processes??