Isn’t that basically just reading the source code? Like I get that’s probably not right to throw everyone toward, but reading source code is a staple task for working with FOSS.
First of all, juniors exist you know that right? Please don't gatekeep.
Second, you're wrong. The Django codebase is overall good quality but if it's "one of the best you ever saw in 20 years" you haven't dug deep. Django has a lot of horrible no good bad awful parts to it. To their credit they tend to improve with age, not get worse, but it's certainly not worthy of such praise imo.
So you know better than me what source code I've read so far? Do you also happen to know what did I do with my spare camera battery? That could be useful.
If you're going to state opinions as facts, you can't then come back and tell people "oh so you know my own opinions better than me?!".
It's not bad, but usually verbose in the wrong bits, and sparse in the details.
They have an entire set of tutorial/getting started type docs that are definitely very wordy and based around getting you comfortable with Django's paradigm, but they do have a rather well done API/Module reference that does a good job getting to the meat of the topic imo.