You can often find criticisms of narrow technical points, such as TRPF and okishio's theorem. But yeah, generally it seems that the most prolific critics of Marxism are, uh, Marxists.
I'm currently reading On Materialism, which makes a lot of hay on this.
One (very imperfect) way to evaluate this is to look at the length of "coding bootcamps". https://www.schoolofcode.co.uk/ , for instance, is 16 weeks of instruction - around three months. You could get a lot out of looking up bootcamps, seeing what they cover in how much time, and then DIYing it.
(I wouldn't actually do one, they can be pretty exploitative).
Worth asking what you want to be proficient in, though. Not all programming is the same; you could become proficient in basic web junk to commercial standards pretty quickly compared to, say, putting together desktop applications to a decent standard.
And pt2: https://cosmonautmag.com/2022/11/the-mature-labor-aristocracy-and-its-problems-part-2-the-size-and-economic-impact-of-labor-aristocracies/
Cosmonaut is a bit hit and miss, I find, but these seem more the former to me, at least so far.
New garden ornaments just dropped
https://lemmygrad.ml/post/287540 inspired me to pick these little dudes up. They arrived today, and I'm blown away - they look much better than I expected. Shout out to "littlestonetreasures" on Etsy.
Still working out where to put them in the garden, some sort of raised plinth might be in order. They can ensure equitable distribution of the strawberries while they're out there.