how did the liberty bell crack

Casting

I believe it cracked when it was rung, then got recasted

I think While transporting from the place to Philadelphia

Due to a defect in its casting

The bell first cracked when rung after its arrival in Philadelphia, and was twice recast by local workmen John Pass and John Stow, whose last names appear on the bell. In its early years the bell was used to summon lawmakers to legislative sessions and to alert citizens about public meetings and proclamations.