[txs]

How do buddypress.org create the different kind of groups?
such as plugin, support and user?
And how to set up Forum index like the one Support use?

@txs

[@mercime]

You should check out testbp.org to see default installation from member viewpoint.
BP Codex – https://codex.buddypress.org/home/
Configure BP Components includes members, groups, forums – https://codex.buddypress.org/getting-started/configure-buddypress-components/
BP Plugins – https://buddypress.org/extend/plugins/ – make sure the plugin you use is compatible with current BP version

[txs]

Also, how do I create project page like bettercodes
http://bettercodes.org/

@txs