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What is NuGet, and what problem does it solve for .NET developers? What is the Global Assembly Cache (GAC), and is it still relevant in modern .NET? How does NuGet resolve version conflicts when two packages depend on different versions of the same transitive dependency? What is strong naming of assemblies, and why is it much less commonly required in modern .NET? What is the difference between a NuGet package's dependency group targeting different frameworks, and why do multi-targeted packages need this? What is a NuGet lock file (packages.lock.json), and what problem does it solve for reproducible builds? What are NuGet package sources, and how do you configure a project to pull packages from a private/internal feed alongside NuGet.org? What is Central Package Management (CPM) in NuGet, and how does Directory.Packages.props centralize version control? How does semantic versioning apply to NuGet packages, and what do version range operators like [1.0,2.0) mean? What is assembly loading context, and how does AssemblyLoadContext enable plugin isolation in modern .NET?
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How do you create and publish your own NuGet package from a class library project?

Intermediate

Answer

Set <IsPackable>true</IsPackable> (default for class libraries) along with package metadata (PackageId, Version, Authors, Description) in the .csproj, run `dotnet pack` to produce a .nupkg file, then publish it with `dotnet nuget push` to NuGet.org or a private feed using an API key.
<PropertyGroup>
  <PackageId>MyCompany.Utilities</PackageId>
  <Version>1.2.0</Version>
  <Authors>MyCompany</Authors>
  <Description>Shared utility functions</Description>
</PropertyGroup>

dotnet pack -c Release
dotnet nuget push bin/Release/MyCompany.Utilities.1.2.0.nupkg --api-key <key> --source https://api.nuget.org/v3/index.json
Real-world example A company publishes an internal SharedValidation library to a private Azure Artifacts NuGet feed, letting every internal team consume it via a normal PackageReference instead of copying source code between repositories.

Common follow-ups: How does dotnet pack decide what files to include in the .nupkg?;What's the difference between publishing to NuGet.org versus a private feed?

.NET CLI SDK & Project Structure (csproj);CI/CD Publishing & Deployment
All 15 Assemblies & NuGet questions