Moodle is 100% Free and open source. This is assuming that you have an IT person or firm that can set it up for you. Plus, you can fully customize it. I started with this to build Ivoryware’s original platform.
Otherwise utilize the tools your organization probably already has, such as Workday (HR tool).
Trying to use paid tools like Canvas or Blackboard is going to be wildly cost prohibitive, and unnecessary.
Only for small business would I suggest leveraging your security awareness provider like Knowbe4 or Proofpoint. Delivery, tracking, and otherwise will not be as streamlined as you think. Plus, you more than likely won’t be using custom content with these platforms, which is a weakness in of itself.