Lots of stuff on the web these days .. still a problem in sorting the good guts from the drivel if you don't have some basics .. you might like to start with the links in the
URL sticky. Note that these are not peer reviewed so there is no guarantee that the rigour is consistent but it is still a reasonable place to start ...
You might also like to become a routine reader of Genghis' mob's discussions over at
Flight Test ...
Just running searches (for things which interest you) in
(a) Tech Log
(b) Safety, CRM & QA
(c) Questions
(d) Flight Test
will give you heaps to read ... the problem is sifting the good from the waffle .. but it is not to hard to isolate the folk who have appropriate backgrounds to permit a presumption of reasonable competence.