If you're very new to that - I'd just recommend picking up some Arduino (at least UNO R3) starter kit plus some measurement tools - multimeter and maybe an oscilloscope (there are cheap handheld ones like DSO).

And then you just fool around with what you've got - try to read each sensors data, try to use each actuator, think of some useful projects with what you've got.

And from there you can go to stuff like ESP32 to explore wireless stuff (mostly compatible with Arduino too).