For .tgz files (compressed tar archives), you'll need to decompress all the files into a single folder before importing. Then use the command immich-go upload from-google-photos /path/to/your/files.
cut --help and man cut can teach you more than anyone here.
But:
"|" takes the output of the former command, and uses it as input for the latter. So it's like copying the output of "echo [...]", executing "cut -d '/' -f 6", and pasting it into that. Then copy the output of "cut", execute "base64 -d" and paste it there. Except the pipe ("|") automates that on one line.
And yes, cut takes a string (so a list of characters, for example the url), splits it at what -d specifies (eg. cut -d '/' splits at "/"), so it now internally has a list of strings, "https:", "", "link.sfchronicle.com", "external", 41488169.38548", "aHR0cHM6Ly93d3cuaG90ZG9nYmlsbHMuY29tL2hhbWJ1cmdlci1tb2xkcy9idXJnZXItZG9nLW1vbGQ_c2lkPTY4MTNkMTljYzM0ZWJjZTE4NDA1ZGVjYSZzcz1QJnN0X3JpZD1udWxsJnV0bV9zb3VyY2U9bmV3c2xldHRlciZ1dG1fbWVkaXVtPWVtYWlsJnV0bV90ZXJtPWJyaWVmaW5nJnV0bV9jYW1wYWlnbj1zZmNfYml0ZWN1cmlvdXM" and "6813d19cc34ebce18405decaB7ef84e41", and from that list outputs whatever is specified by -f (so eg. -f 6 means the 6th of those strings. And -f 2-3 means the 2nd to 3rd string. And -5 means everything up to and including the fifth, and 3- means everything after and including the third).
But all of that is explained better in the manpage (man cut). And the best way to learn is to just fuck around. So echo "t es t str i n g, 1" | cut ... and try various arguments.
Well, the brain explodes at the computer. And I'd guess the insides and outsides of a computer are easier to clean with a small sponge (depending on the setup ofc).
The problems that persist: Very rare issues with decrypting (as I rarely encounter it, while being in encrypted chats with 150+ users, it's not an issue for me), apart from after you changed clients, slow image loading (a bit annoying, but ok if you multitask anyway) and clients all having different feature sets (some of which you can also hackily make work in others).
Not worth it, but more or less needed: