Don't worry, I have curated the list to only list up-for-grab/help wanted issues that has no assignee and no PR linked if possible, so you'll start to hammer those keyboard to write a fix/feature/whatever code for PR :)
Here's the list:
- .NET Core Runtime: https://github.com/dotnet/runtime/issues?q=is%3Aopen+-linked%3Apr+no%3Aassignee+label%3Aup-for-grabs
- .NET Roslyn: https://github.com/dotnet/roslyn/issues?q=is%3Aissue+is%3Aopen+label%3A%22help+wanted%22+no%3Aassignee
- .NET Core WinForms: https://github.com/dotnet/winforms/issues?q=is%3Aissue+is%3Aopen+label%3Aup-for-grabs+no%3Aassignee
- ASP.NET Core: https://github.com/dotnet/aspnetcore/issues?q=is%3Aopen+is%3Aissue+label%3A%22help+wanted%22+no%3Aassignee