For microcontroller projects, you can go pretty far by taking example projects and modifying them. For low-medium speed, low-medium power, low-medium voltage pr

For microcontroller projects, you can go pretty far by taking example projects and modifying them. For low-medium speed, low-medium power, low-medium voltage projects, if you follow the guidance in the chip manufacturer's data sheet, it'll work well enough for personal use. Upverter (YC-funded) is a great web-based PCB design tool. There's a free version, and a convenient way of ordering PCBs. They have a large community providing open-source examples you can start from.