I had a background more heavily rooted in PLC, HMI, control systems, industrial systems, and project management cradle/grave of those types of systems. While I picked up a lot of general knowledge, I recently decided to switch to a new role and go heavier into a more specific and direct field of electrical engineering. I have pretty much 0 PCB design knowledge--beyond the last few weeks using Altium. What would be a good resource for delving into the area listed in the title when projects range from simplistic to graduate level complexity?