To begin with I’d concentrate on making a sound that you recognise. Forget learning proper chords for now, they are hard, require several fingers and hurt, both in a sharp on the fingers way and also in a muscle achey way.
5ths or power chords only need two fingers and are the same shape all over the fretboard, just moved up or down a bit.
Slide the selector switch on the guitar to the back or second from back position for a meaty rock sound and let the fat of your hand rest on the strings, damping them, you’ll be a rock god before you know it.
https://tabs.ultimate-guitar.com/n/nirvana/smells_like_teen_spirit_ver3_tab.htm