[NEED TUTORIAL] How do I manage many accounts of a single website from a single PC?

Like how do I handle many youtube accounts from a single pc?? I know we are supposed to use a proxy, some plugin, and what not.....but I do not know the exact process., Can any1 give pointers to me please so that I can manage many accounts safely from my PC?
Thanks in advance.

Just Use "Multiloginapp"

chrome has multiple user profiles