This is going to sound really basic, but a good start might be just to reproducibly generate and measure some signals: DC, AC, etc. Make an LED blink. Measure the voltage across the LED as a function of time. Get used to seeing a graph of voltage versus time, and interpreting it. Hook it up to a microphone and talk to it. Measure the headphone output of your PC.

This is all about just learning to think in terms of signals (static and as a function of time) and how they are measured. Try to predict what's going to happen, and see what you get.

You learn hands-on Electronics (and Embedded Systems) using these types of equipment. If you can afford it i would suggest Digilent's "Analog Discovery 2" (https://store.digilentinc.com/usb-scopes-instruments-circuit...) Digilent has lots of online course material (https://reference.digilentinc.com/reference/instrumentation/...) which you can follow-along to learn Electronics.

It gives the following very basic pieces of equipment for doing hardware development. However this is quite low end and will have lots of limitations. A high end logic analyzer could be $50k for example.

USB Oscilloscope - observe an analog output waveform

Signal Generator - supply an input waveform

Power Supply - power the device

Logic Analyzer - observe digital signals

Multimeter - get average voltages