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Is there some standard "here are existing 10 services and in this guide we'll go through deploying them, securing them, installing service mesh, provisioning database..." kind of thing?
Setting up only the cluster? - Start by porting your local setup to a local k8 (minikube etc.)
And i would suggest to invest some time into terraform to setup everything the way you want it.
All of setup step is simple, there're many resources that you can follow and learn all in 1,2 days.
But in general: learning by building stuff based on a real need -- even if that "need" is just to scratch the itch of some personal project you've always been wanting to do -- has about 10x the staying power (and "interview cred") as what one gets when starting from the mindset of "oh shit, I'm falling behind, I gotta cram on this stuff".
And on top of that: knowing when you really need X or Y, and when you don't -- is often as valuable as, or even more valuable than simply knowing how to do X or Y.
To get the skills for yourself is a different matter: hire a specialist for a day and go through a basic app deployment, workflow and notes for a day. Complement with the basics tutorial to avoid gaps, try your skills on a real environment.
But such infrastructure skills are no joke and mistakes are expensive so I would recommend to take your time learning about it.
The course content is a bit wanting (it sometimes feels more like an advert for GCP products than a course), but if you watch the videos that look relevant and do the labs, I think you’ll get something out of it. Coursera does cost money but has a free trial.
Sure, you can get something basic running very quickly but if you are talking about production systems, "ramp up"? then there are many things to learn, understand and avoid and this takes an amount of time.
For an example, as a very experienced Dev and Ops person, after 18 months of Kubernetes, I am still learning things that I should have ideally done from day 1 and probably only avoided problems because I am not using it with very high traffic.
You can read lists and follow tutorials but engineering is trade-offs and even in the world of nice tooling, there are still many decisions to make and don't end up in a position where, for example, you cannot upgrade an ingress without the system becoming unavailable because you didn't consider this early on.
Don't get me wrong, it is worth learning but it is not fast.