default modules installed on first installation

How many or which default modules installed on first installation of folio?

Do we need to install all one by one from Github?

I do not know which guide you are following, but this one might be useful to experiment with your initial installation:
https://github.com/folio-org/folio-install/blob/master/single-server.md

It shows how to obtain the set of modules that were the “core” modules at the time of that quarterly release.

It would be better to ask software-related questions in the “Software” forum, or perhaps in the Slack #support channel