Update App without packaging everytime

I have huge project but packaging every time is not possible here,
cause every time i change something i have to package the whole project and its taking my whole day
so, I’m looking on patching but not understanding how it work or anything rather than patching better to fulfill the problem,
and also im bit confused in HTTP-chunk (how it works), .pak(how it use for patching) files.
any documentation or definition will be good deal for me.