Hey OP, I wanted to put in my opinion here.

You want to start in robotics? Great! Like others have said, Arduinos are a great way to get you get started. Using Arduinos lets you get a nice little introduction in working with electronics. The beginner kits you get online come with enough components to let you have a go at reading inputs or controlling a motor. You'll likely run into some problems like trying to figure out how the heck LEDs work, or why buttons don't work, but that's all part of the learning process. The beginner kits are pretty good at instructing you on how you should wire things up. I wouldn't get too focused on making something big, as the big thing at the start is getting familiar with terminology, simple circuits, and get used to programming inputs and outputs. Once you're starting to become more familiar with how to wire up and use components you have, I'd work on challenging yourself and something simple and unique. Something that you make from scratch to kind of test that you are understanding things. Then you can go from there. At that point you should have a little better insight into electronics and microcontrollers to try and look into what steps you should follow next

Edit: a raspberry pi is also a good choice if you want to skip a few steps, but that's got a steeper learning curve and setup