Beam training and tutorials needed

Hello, I am wondering if anyone has useful links for working with structural beams? For example, I once had a link to a short video that demonstrated the use of merging or fusing structural beams in windows and doorways to add depth and texturing.
One Drive thought my desktop looked cluttered and wiped all icons and folders. Searching on 'Satisfactory Beam' does not go where I need it to.
I am remembering a video where structural beams were used like Bezier control handles for building railway. If I cannot rise to the architectural challenge that this game passively presents, I do not know what I am going to do.