Didn't really know
Back a couple of decades, I was given a job I really didn't qualify for, as a junior SAS programmer, on the basis of my ability as a statistical data analyst, drawing from my PhD. Dissertation work. So I had to learn SAS pretty much on my own. At that time (1989), there were only two books available: the 3" thick SAS manual, and a barely-there introduction. The system 'ran' on a Data General mini-computer, and had only dumb-terminals and line printers.
What a blast! I never got training at the SAS Institute -- trial-and-error, on-the-job training from the get-go! Towards the end, there was a beginning effort at Micro-SAS and a SAS-MAP program.
I had to leave when the program was de-funded, and never was able to get the needed training to get a certificate. Sigh!