hnglt

This wasn't my introduction to logic, but I like to skim it for refreshers, and it seems well-written enough to me.

My introduction was What is Mathematical Logic? by Crossley et al., which is a master class in terseness and probably more suitable for someone who's already got a foundation in logic. I must've read the first three chapters three times each, and the rest fewer times than I should've :-).

I agree that the interplay between related topics helps me form a more robust of understanding of the material.

On the other hand, it might be worth considering proactive and retroactive interference, (the difficulty of storing similar, long-term memories). The layman's takeaway is that it's generally better to learn a variety of non-related topics concurrently instead of similar ones in order to facilitate better long-term recall.