The proper way is to have two cables connected to a battery post, one to the moror if it's a starting battery and another to a distribution devise such as a fuse or breaker panel. Most factory setup use a 30A fuse and #20 wire to feed a console. That is adequate, since you are not going to feed more than 30A to a console. Anything bigger is overkill and the larger wire will require a larger fuse. The fuse should be as close to the battery as possible. It's purpose it to protect the wire, not what i's feeding.
I can always pick out a customer who knows nothing about wiring. There will be multiple wires and multiple colors gong to his battery. Having wiring like that not only makes it difficult to troubleshoot issues, it's just plain and simple sloppy work.
FWIW, ABYC only permits four connections per terminal and that includes battery posts.
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