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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.
Yes, actually, you can. If you need more amp hours, you can wire several batteries together in a parallel configuration. This means you hook the positive post of the first battery to the positive post of the second, and the positive post of the third, and so on...and the negative posts in the same way. If you hooked 20 6v, 10 AH batteries together in parallel, you'd end up with 6 volts, and 200 amp hours.