I know it sounds dumb but I just got the L and R string launcher, and I don't know if I should let go   Of the string when I pull it, or hold on to it. Also what are things that can break your string launcher.

let go. dont hold dont spin bey on launcher and yea

To use a string launcher, you pull the handle and as soon as you feel the string stop, let go. You use your thumb and 2 forefingers and a light grip on the handle so you will let go more naturally.

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Beyblade Burst is cool, I once made a continuation of MFB, but I stopped, but now I've restarted (Then stopped again). Geist Fafnir is also pretty cool

MR System Beyblade: https://worldbeyblade.org/Thread-4th-Season-MR-System

Don't put your middle and index finger on the protrusions of the string handle, you will find it hard to let go when the string is at its max.

I use a "pinch" to hold the "head" and it naturally slips out when it hits the max length

Ya boi comin in wit da clutch

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Ya boi comin in wit da clutch

Wbo has a vid like that, I thought I saw them all lol, also thanks