Just bought a 2013 Volt with 62k miles. what should I expect in terms of maintenance and do you have any Volt pro tips?

Title. I was slightly nervous buying a 9 year old car for $14k, but they seem reliable based on what I've read, and I've really wanted some kind of EV for a while now. Any heads up on issues I might have or any tips or things you wish you knew? I'm loving how it drives so far.

I've temporarily set up a 12 gauge heavy extension cord and have it hooked to the charger in a plastic box and have weatherproofed the actual connection. Having an electrician out tomorrow to see about setting up an outdoor standard or maybe 220/240v outdoor plug so I can forgo using an extension cord and maybe even get a level 2 charger. I've read the 2013 Volt only benefits up to 16 amp/3,300 watt, is that correct?