What up /sci/, brainlet mature age engineering student here. I'm in my fourth year of civil and while I can understand the material in my units pretty well, I often struggle to solve problems because I'm missing a bunch of basics and little tricks because of the 10 year gap between my high school math/physics and university. I'll look up a youtube tutorial on how to solve something and they'll get to a step and say 'so we can just use similar triangles' or something and I'll have to stop and look it up to understand what they're doing. I can usually get to the right answer in the end, but with a slow and ugly method. So, what little tricks and shortcuts should I memorise to help me? Stuff like this usually comes up in free body diagrams or graphical stuff, so I think it's mostly geometry.