ethanaquino

so i just recently got a pc and i got java, basically i wanted to start a world with minor vanilla tweaks and stuff (i use forge to get my mods) and i was wondering this, is there a way i can downgrade my forge to get older mods but keep the world or a way to upgrade and have the same world? also wondering if i can move my world from forge over to vanilla minecraft because i like mods and all but i might wanna take them off. just wanna know if there a way how i can do these things with out losing my world