Windows 11 is a good operating system. It's faster on modern hardware than Windows 10 in most benchmarks, has better memory management, and the Start menu — once you move it back to the left where it belongs — is fine. The upgrade path is straightforward on qualifying hardware; it's annoying on hardware that doesn't qualify, and there are ways around it.
First, check if your machine qualifies. Microsoft's PC Health Check app (free from Microsoft) scans your machine and tells you if it meets Windows 11's requirements. The main gating factor is TPM 2.0 — most machines from 2018 onward have it, but it's sometimes disabled in BIOS. If that's the case, enable it in BIOS under Security settings.
The cleanest upgrade path: Windows Update → Check for Updates. If your machine qualifies, Windows 11 will be offered. Download and install. This is an in-place upgrade that keeps your files and apps. It usually takes 45–90 minutes and requires two reboots.
Before you upgrade: back up. This should be obvious but isn't. Use Windows Backup to an external drive or a cloud service. In-place upgrades almost always work perfectly, but 'almost always' is not 'always.'
If your machine doesn't qualify but you want to upgrade anyway: the Rufus utility (free, open source) has an option to create a Windows 11 USB installer that bypasses the TPM, RAM, and CPU checks. This is officially unsupported by Microsoft, which means you may not receive future updates. For a machine you're using for another year before replacing, it's a reasonable tradeoff. For a production machine, it isn't.