Should I keep tinfoil on my jars?

I gotta go so I can't research for a little while. Anyways I have 4 jars, 4 plastic cups and 2 glass cups. So on the jars should I leave the tinfoil on? And should I poke holes in the tinfoil on the cups? And I do have vermiculite on the top.

on jars, the tinfoil is just to keep the water from getting in during the pressure cooking process.
once you inject with spores, you should remove the foil, and never put it back on.
cover the needle holes with medical tape.

Correct. You need to leave the holes open for the jars to "breath". Correct term is gas exchange.