The preceding is good advice; however, it does not offer much more than generalizations, albeit valid, for the “intermediate” (?) player. The following is intended to state what many perceive to be blatantly obvious, hence “you did WHAT!” face-palm deaths. This really should be cleaned up and refactored, but placing here for now.
WARNING. I have yet to defeat Angband. This is a compilation of some of the better tips I’ve learned while trying to explore the depths… (to Level ~35). Additional advice would be greatly appreciated!