there is sooo much to talk about when first getting into it. but doing a little research on your side might help... like batteries and brushless motors vs brushed motors...
i for one. the next truck i get will be the new e-maxx brushless edition with some high output set of lipo batteries...
lipo batteries need to be researched on your own for sure.. there is to much for me to mention... other than.. they are much much more dangerous than any other hobby battery you can think of... think im joking.. youtube "lipo fire" very dangerous if not handled correctly. and of course taking care of them.
but lipo is oh so worth it. for run times and power. not only is brushless for power but lipo is like 4 fold more. over the best NiMh battery.