what enjoy the most is to trace back the words right to their origin. i had little study on Mazandarani(tabari\tapuri) dialect spoken is Mazandaran province of Iran. traced back some words to their protp-indo-europian roots (i hope i did it right). one of them for example:
val /væl / (adjective) wry [neo-persian: χol=stupid middle persian: χɔhɜl=wry, mad pal: χvæhl=wry peo: *hrɑχrɑ from root *hvɑk san: vɑkrɑˈ PIE root: *suek-=to bend, to arch it, also forms old german: wanga deu: wange both mean "cheek". san: vɑkræŋɑ=goose; vakra(awry organs) + aŋɑ(creature). this PIE root is correlate with PIE: klo-dhro which forms lat: coluber forming fra: cobra forming fas: kɔbrɑ.]
now i want to progress further and do some more but i need some help on finding rich references especially on extinct Indo-European languages.