Best agile and working tracing tool ever: https://www.pivotaltracker.com/ How to...

Best agile and working tracing tool ever: https://www.pivotaltracker.com/ How to apply that to agile, happy teams and working simply? My online course covers all the details: https://agileforleads.com/

I have used JIRA, TFS/VSTS, Trello and other in production on various products so this opinion is based on years of experience and pain with the 'wrong tool'.