I agree with using a spreadsheet program. If you have Excel, great. I use Google Sheets. I tried OpenOffice but it would crash a lot.
I was a programmer for over 32 years. I never had the desire to create a database with a gui interface. Too much work, and I thought the use of one would become burdensome.
I see some have columns in their spreadsheets that I see as excessive. I'm not going to catalog each piece that I own like it's an historical artifact!