kfetters, Welcome to Tnet! Ones own back or front yards, including side yards, can be the best places to detect and to Learn on. This is true as you are generally free to do what ever you want and that includes really taking your time detecting each target, writing down the numbers the machine gives you and listening to what the sound for each target can tell you and then finally pulling the target from its grave and seeing what it actually is and adding that to your notes. Pennies are great as well as nickels and dimes.
I consider all new coinage to be accessory money and it can pay for quite a few nice toys especially the ones that aid you in finding even more coins, things like coils. Keep on practicing as it will pay off.....................63bkpkr