The teacher asked that the user access to the site, and then invest together, but must carry on the grouping, for example a group of five people, users came in, automatically grouping, also don't know who he and a group of users, I'm more confused now, how can you to enter the website user group, and let them can undertake data interaction, now I am learning the basis of the framework of vue and PHP, want to know what should study direction,