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The instructions in the "Lab 3.2 - Managing Applications with Argo CD" section of the course are not working.

The image(s) that we are downloading from docker hub https://hub.docker.com/r/liquidreply/argocd-example-app/tags is/are built to listen of port 80, but the deployment has 3000 as containerPort in the deployment.yaml manifest, and the service is using that wrong port too. The instructions for port forwarding are starting the forwarding but fail on the first request:

Forwarding from 127.0.0.1:9090 -> 3000
Forwarding from [::1]:9090 -> 3000
Handling connection for 9090
E0526 23:06:57.873145 39534 portforward.go:413] an error occurred forwarding 9090 -> 3000: error forwarding port 3000 to pod 78b33df8339f89d73c24aae388e0913977aa0b5db2a5ccec072b1d03f23d77d2, uid : failed to execute portforward in network namespace "/var/run/netns/cni-ece8624f-bf66-fe0f-9360-919d6b944074": failed to connect to localhost:3000 inside namespace "78b33df8339f89d73c24aae388e0913977aa0b5db2a5ccec072b1d03f23d77d2", IPv4: dial tcp4 127.0.0.1:3000: connect: connection refused IPv6 dial tcp6 [::1]:3000: connect: connection refused
error: lost connection to pod

If you change the port in the manifests from 3000 to 80 everything is working as expected. I can only guess that you have migrated from express app to nginx web server and have not changed the build parameters in the manifests but this is only a speculation.