This forum isn’t the most active and asking here and not getting an answer isn’t surprising me at all.
I would recommend to set aside some time to figure it out yourself and simultaneously try to get IRC to help with the effort.
This is also my problem but working on an installation as opposed to just the package manager is a much better way to learn, IMHO.
I guess, this has to do with infrastructure problems of which some are DDOS attacks and switching to the new source (codeberg) could help.