Tips shouldn’t be the main source of income. It should be a bonus for good work. Tipping culture in the us is getting crazy compared to Europe. The base salary should be enough to be able to live on.
Docker inspect $container should return you most of the info for the container. You can also get a shell inside the container via docker exec -it $container sh. If you have a dockerfile for the container you can see how the container has been set up.
Additionally the shell history can also yield useful information on what has been done. Docker saves the logs of running containers in /var/lib/docker/containers
LFCS should be on par with RHCSA. CKA is also a good certificate which should get you a good return.
From my point the RHCSA is still a valid exam despite RedHats recent moves. HR Drones and Managers won’t care what RedHat is doing as long as they are supporting their products.