Want to learn Guitar scales, but don’t know where to start?

I’ve been playing Guitar for about 4 months now so i’[K-ON!] not as big as a newbie like i use to be, I’ve got a Electric guitar and my dad reckons i should Learn guitar Scales and everyone on internet reckons to be a good guitarist you should learn Your basic scales, So i thought i might as well give scales a try but i don’t know where to start? Does anyone know any good ways to start? (Don’t post video links Please).