Principles of NMR
A classic online text is Joseph Hornack’s Basics of NMR.
Paul Callaghan’s lectures provide an excellent introduction to the physics of magnetic resonance.
The NMR periodic table shows which elements are suitable for NMR experiments.
Here is the version of Rider University:
A. Jerschow’s version of ordering NMR active elements is also interesting:
There are several software packages, which allow the prediction of NMR spectra.
NMRDB (FCT-Universidade NOVA de Lisboa ) is a free and can be used directly from a web browser.