A small device inventory saves time when you need a manual, support or a compatible accessory. It need not be elaborate. A simple list that you can maintain is more valuable than a complex system you stop updating.
Record the manufacturer, model, purchase date and the location of any receipt or warranty document. Include the type of charger and the accessories that belong with the device. Keep identifying numbers private rather than sharing your complete inventory publicly.
Add a link to the official support page after checking the exact model. Similar product names can refer to different generations. A clearly labelled manual makes later troubleshooting less dependent on an uncertain search result.
When lending equipment, note who has it and which cables went with it. When retiring an item, update the record and follow the manufacturer’s instructions for removing personal information before passing it on.
Schedule an occasional review rather than trying to catalogue every cable in one afternoon. The purpose is to make ownership easier: knowing what you have, where its documentation lives and which items are ready for repair or replacement.