Okay. Are there any reliable, accurate, understandable videos on Youtube? Can anybody help me start off? My friend can do a bit of virbrato. So yeah...
Anyways, simply: realiable Youtube videos and/or worded explanations. Am I being too vague? :heh:
Oh yeah, how about a wrist virbrato? There, now I'm being specific. XD

I'm not exactly a master of it myself, but there is a way.

Put your finger on the string, not so far out, yet not too far to make the note sound sharp. Then you move your hand, but not the finger.

It's pretty hard to explain it. :/

go on youtube and search violin vibrato thats how i leraned it but I play the viola more eh same thing lol

Vibrato is not that hard. First off you have to be sure you can hold the violin correctly and that it's comfortable. Next is can you shift with relative ease. Like going from 1st position for 6 notes then quickly to 3rd for 2 notes then back to first. Once you can shift effectively vibrato should come with ease. There are 3 types of vibrato, finger, hand, arm. Finger isn't that noticible but is effective for quiet passages. Arm and hand are for like quick and esspresive sounds. Try putting your scroll agianst a wall so the violin is still and pulse your finger backwards then foward. Increase speed as nessary and switch fingers. Also bow at the same time so you can hear it and try to do it away from the wall.

as nasty as this sounds
many can liken it to just masturbating the fingerboard xD

it literally is a similar motion
as crude as it sounds. yeah...
or rock your finger a bit
essentially you are kinda like sliding the note up and down slightly, that creates the vibratio sound

To practice vibrato, keep your finger on the note you want to play. Slowly rock your fingers from flat to sharp. After doing that, relax your wrist, make sure it doesnt touch the scroll and then do it a bit faster and faster ^^