In my opinion the series starting with https://medium.com/@teddyking/linux-namespaces-850489d3ccf https://medium.com/@teddyking/linux-namespaces-850489d3ccf is

In my opinion the series starting with https://medium.com/@teddyking/linux-namespaces-850489d3ccf https://medium.com/@teddyking/linux-namespaces-850489d3ccf is the gold standard for introducing namespaces.