Hello. I am a graduating undergrad about to start my PhD program in the Fall (I am going into mechanical engineering for orthopedics research). I will have a lot of free time this summer and would like to develop a skill that would be useful for my research and/or classes. I am thinking of touching up on my MATLAB skills but am wondering if there is anything current/past PhD engineering students wish they knew well before starting their program. This could be a software, statistics method, or other resource that I could easily access. Thanks!