Risk assessment for critical assets or confidential assets?

Answer:
I am not sure if I have understood your question 100%, but the risk assessment is not prepared for specific assets (critical or confidential) it is for all assets of your organization, and you can find various types of assets: hardware, software, people, etc.

This article can be interesting for you “How to handle Asset register (Asset inventory) according to ISO 27001” : https://advisera.com/27001academy/knowledgebase/how-to-handle-asset-register-asset-inventory-according-to-iso-27001/

And also this one “ISO 27001 risk assessment: How to match assets, threats and vulnerabilities” : https://advisera.com/27001academy/knowledgebase/iso-27001-risk-assessment-how-to-match-assets-threats-and-vulnerabilities/

Finally, our online course can be also interesting for you because we give more information about assets “ISO 27001:2013 Foundations Course” : https://advisera.com/training/iso-27001-foundations-course/