I did not give RTFM as a response.

sundialsvc4 asked how did you take your first baby steps? , and baby steps are always RTFM for me.

Then test and examples directory. Then I whip up benchmark for a part that interests me. If benchmark looks promising, then I scrutinize things more.

There are no "potted wisdoms" to be had outside of the current documentation, tests and benchmarks, that is just line-noise.