This is a fairly easy song its in standard tuning
[ Tab from: https://www.guitartabs.cc/tabs/n/nirvana/tourettes_tab_ver_3.html ]
E----------------------------------------------------------
B---------------------------------------------------------- Repeat 4 X
G----------------------------------------------------------
D------3---4-----------------------------------------------
A--4---1---2---5-------------------------------------------
E--2-----------3-------------------------------------------
E----------------------------------------------------------
B----------------------------------------------------------
G----------------------------------------------------------
D-----2----------------------------------------------------
A--4--4----4--4--4--4--------------------------------------
E--2-------2--2--2--2--------------------------------------
Repeat whole song 3 X