I did the same with my son's computer and RX580 graphics card. He games during the day, I mine at night.

Until one night the PSU went bang. £40 later, and I realised that it would take over half a year of night time mining just to recover the PSU cost.

I now don't mine anymore as the returns are too small on a personal computer. And I don't have the spare capital to buy a rig or ASIC. But it did get my journey into Crypto started.

Good luck with your ventures and journeys too... we all have different paths and experiences and I hope that you enjoy yours :-)