I'd look at the discrete stuff before looking at arduino and raspberry pi. Start slowly and build some kits. You need to learn to solder and you need to learn h

I'd look at the discrete stuff before looking at arduino and raspberry pi. Start slowly and build some kits. You need to learn to solder and you need to learn how to "debug" hardware. You also need to get some tools. If you start small then it should be cheap(ish). Once you get a hang of the practicals you should look at the theory as mentioned in another comment. Back in the day 25 years ago I was amazed at my first job after graduation, several of my co-graduates had never used a soldering iron let alone built real things. Have fun