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ASP.NET Core
ASP.NET Core is a cross-platform .NET framework for building modern cloud-based web applications on Windows, Mac, or Linux.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
As far as authorization, the link above uses a project called HiemGuard to protect the endpoints.
Then I would follow 2-3 tutorials on "asp.net core jwt" as you will likely learn something different from each one.
I created this: https://github.com/TopSwagCode/Dotnet.IdentityServer for learning Identity server with different clients and api's.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.