There are several ways to keep track of your wine inventory. One simple way is to create a spreadsheet where you can list the name of the wine, vintage, producer, quantity, and location. You can update the spreadsheet every time you buy or sell a bottle of wine. Another option is to use a wine cellar management software, which allows you to track your collection, add notes and ratings, and set alerts for wines that are ready to drink. Additionally, you can use wine cellar tags to label your bottles and keep them organized by region, varietal, or drinking window.