@Sean W
Hi,
For an up-to-date list of end-of-service dates for each Windows 10 version, see the Windows lifecycle fact sheet.
https://support.microsoft.com/en-us/help/13853/windows-lifecycle-fact-sheet
Updates are cumulative, with each update built upon those that preceded it; you should always install the latest feature update (version), before your current version reaches end of service, to remain supported by Microsoft thru monthly quality updates.
Windows 10 Home and Pro follows the Modern Lifecycle Policy.
Windows 10 was released in July 2015, and extended support is slated to end in 2025.
For your reference:
https://learn.microsoft.com/en-us/lifecycle/products/windows-10-home-and-pro
Hope above information can help you.
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