Mandatory OPC-UA services - opc-ua

Can anyone tell me the OPC-UA document in which I could find all the mandatory services provided by OPC-UA?
Thank You in Advance!
With Regards,
Avdoot Chalke

OPC UA Specification, Part 7: Profiles
https://opcfoundation.org/developer-tools/specifications-unified-architecture/part-7-profiles/

It might be not easy to figure out that reading specs.
There is online tool which is useful to figure out what is mandatory and what is optional for which profile: https://opcfoundation-onlineapplications.org/profilereporting/
Actually, I see that the page on the previous link has reference to this tool too (interactive profile viewer).

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