Ask many organizations exactly what devices, licenses and subscriptions they have, and the honest answer is a shrug. That gap quietly costs money in unused licenses, unpatched devices and surprise renewals, and it is a security risk too.
Start simple
A living inventory of hardware, software and subscriptions, with renewal dates and owners, is enough to start. It makes patching complete, budgets accurate, and audits painless. It is one of the least glamorous and highest-return things we set up for clients.