We have a main website that is coded using the materializecss framework and the only purpose of that part of the website is to host a bunch of information. We have a second part of the website where we're setting up Q2A to handle questions. We wish to hide some content on the main website from the public (i.e. so only registered users can see it), and we wish to restrict the ability to ask and answer questions to only registered users on the Q&A part.
ELI5 what is the best way to setup users? Assume I'm a retard, because after staring at the documentation for an hour or two, I feel like one. :)