Postby DanielMcLaury » Sun Mar 11, 2012 4:19 pm
The best book I know of for a really undergraduate-level presentation of Lie algebras is Erdmann and Wildon. It has a few pages on the modular case in the back, and specifically refers the reader to Jacobson, Strade and Farnsteiner, or Jantzen for further reading. From what I can see by flipping through a few pages, these latter books do not appear to be at an introductory, undergraduate level. Given that, it's probably worth familiarizing yourself with the characteristic zero case first and worrying about modular Lie algebras later.