For general (non tool-specific) training on hardware asset management for somebody looking to learn the discipline, I would suggest considering a local training provider that provides training around IAITAM's Hardware Asset Management Professional certification (https://iaitam.org/champ/).
Training classes run by the Flexera Services group touch on various hardware asset management topics, although this content typically focuses more on how to use the tool rather than specifically training on hardware asset management as a discipline. Some Flexera partners also offer training classes which may be helpful.
Flexera also provides various training content - including videos - in the Flexera Learning Center (select Other Resources > Learning Center in Flexera Community), some of which will touch on hardware asset management while focusing on different use cases for working with Flexera products. Do be aware that some training content in the Learning Center is only available to users from active Flexera partners and customers.
With all of that said, most of the tool-focused training available that I know of is primarily aimed at people who are leaning tools to use them, not necessarily to help with assessing tools to see whether they would fit a need. So if your main need here is a tool assessment, you may find that the training options don't quite match what you're looking for.
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