I'm pretty sure you already heard about this one, Infinite Boats in Bedrock edition beta. But what you haven't heard of is a use even more broken than infinite boats. In bedrock edition, Boats can be used a a fuel source, and they're pretty op. But with this glitch, all you need to have infinite fuel is to place a boat in water, the original item won't dissapear, break the new boat, and then put it in a furnace-type block. Now you have infinite fuel.

The RP I'm using is Classic Vanilla. You can find it at MCPEDL
A video of the glitch: YouTube Video (pls sub)