I wouldn't be able to build if it wasn't for build videos. My early sims had houses missing roofs etc as I couldn't understand how all the tools worked. Build how to videos taught me the basics and watching other builds gives me inspiration on the endless possibilities of build mode. I have learnt to do dormer windows, pergolas, rotundas, curved paths, conservatories and exterior decorating with non traditional pieces from videos. I watch them much less now (but same for CAS videos) as I want to do my own things and use the ideas I learned. When the terrain tools came out - I watched them a lot more frequently again. And some simmers just do entertaining videos whatever they are doing including build mode.
