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Randy Day

wrote:

[snip]

So if I wanted to test a LED with a 9v battery, how do I know which
leads on the LED to connect to the POS and to the NEG on the battery,

You won't hurt the LED if you hook it up backwards;
you just won't get light.

and what size resistor do I use?

1Kohm works.

Does it matter if the resistor is on
the POS or NEG side?

No.

Also, reading what you said, does this mean that if I connect the LED
backwards on the battery it will burn out?

Not on a 9v battery...