A massive part of puncture avoidance is looking where you ride and thinking about your position on the road.
Nervous, less confident riders will hug the gutter and ride in areas where the traffic doesn't go, like chevroned sections, parking bays and marked cycle lanes. This is where a lot of the potential puncture material resides and by riding there you are multiplying your chance of picking up a foreign body in your tyre.
More experienced, confident riders stay further out from the kerb/gutter and follow the driven line more of the time. This part of the road is effectively 'swept clean' by all the vehicles and offers the lowest risk of suffering a puncture if you can ride there. That pale, polished line where the left wheels of all the cars normally run is quite a good place to be.
Good luck on L2P. Make sure you have your puncture repair kit with you and have practiced using it