I run a small departmental store and want to organise the basic information I have about my customers so I can reward the most loyal ones with discounts and special offers. My budget is tight, so I’m counting on open-source or completely free tools—be that a lightweight CRM, a Google Sheet enhanced with scripts, LibreOffice Base, or any other solution you can recommend that will not add licence costs. What I need you to set up for me: • A straightforward front-end screen (desktop or browser based) where I can type in a customer’s details. I’m happy to take your advice on which fields make sense beyond the obvious name, phone or email—feel free to suggest anything that helps with future promotions. • A second screen or report that shows, at a glance, which customers have shopped the most often and how much they’ve spent in total. Sorting or filtering by date ranges would be a bonus but isn’t mandatory as long as the core ranking works. I have no prior IT background, so please keep the workflow simple: click, type, save. If the tool you propose needs a small install or a cloud sign-up, walk me through it. A quick user guide or short video would be appreciated so my staff can use the system without calling you every time. The main goal is clarity, low (ideally zero) running costs, and something I can expand later if the store grows. If you’ve built similar setups—especially with free software—let me know how you’d approach this and approximately how long you’d need to deliver a working prototype I can test with real data.