Community means practitioners.
Practitioners means people who are living in the same transmission, in the same boat, traveling towards realization in the same way. This means that we must know how to collaborate with each other because if we don't know how to do this, if we are not collaborating well we can have problems with the transmission and with the guardians. So try to be aware. For that reason we practitioners collaborate with each other and that is called community. Community is like a boat crossing a very big river, and if there was no boat we couldn't get across that river.