Building Building Blocks from Building Blocks

Hello! I wanted to get into blueprints and watched tons of basics for UE4.

Can you recommend me some tutorials that cover the necessary blueprint components
and what components should i look up? For this ->

I’d like to make a tiny project where you put together building blocks, similar to tetris-bricks with rounded cubes. I guess I have to model the beveled cube-sections (all variations) first, build an editor in blueprint, and then merge them together into one building block (f.e. beveled tetris-shape), make it placeable on a surface like a landscape in the game. and hopefully a destructible with apex destruction. Not back into cubes though, more like splinters.

Thanks so much in advance