If you are a visual learner, YouTube is a cornucopia of free knowledge. Depending on the subject, there are also a multitude of free online college courses from major institutions such and MIT. It really depends on the subject and your learning style. And of course there is also ChatGPT (or similar) which make excellent tutors.
Not to totally side track this subject, but I go back to 51800 and DTM on CTOS.
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I would be curious to see this same test using pure Object script (M) and globals.