When you play an mmorpg or single player RPG and you walk to a new “zone” you sometimes see the message appear in the middle of the screen telling you, the player that you are now entering a new “zone”, even thought there was no loading screen you transferred from one zone, to the next. I am assuming developers do this to save some memory not to load the entire world in one go, and I was wondering if some experience unity developers could share some of the techniques people use to create large, but seemliness worlds with different “zones” or nodes or sectors or whatever you feel comfortable calling them 
I am a college student on my second year in an IT program.
I know tons of html, php, javascript, databases.
And on the other side I know c# and java.
this is for a solo side-project I want to do for myself, as I believe the best way to learn is to just dive in and do it.
Thank you in advance.
