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When connecting your battery, connect the positive (red) first and the negative (black) second. When removing the battery, disconnect the negative (black) first and the positive (red) second. Been doing this for nearly 30 years. ALWAYS connect the positive post first.
It may not have a fuse, but it may have a fusible link. If the wire looks like it only has two ring terminals, it doesn't have a link. If you add a bunch of accessories (high-capacity alternator, power amps, pumps, blowers and lights), you would need to increase the charging lead. If not, you can leave it as-is.