Heya Freerichie! Welcome!
There is a lot of room to swim in electronics. I suppose it depends on your field of interest.
Assuming that you've already messed around with the general "newby" circuits such as the 555 timer, and general Op-amp circuits, etc. I would suggest messing around with power supply circuits, as they form the "beginning point" for many circuits, specifically circuits that use AC power and covert (rectify) to DC. I would become familiar with transformers, rectifiers, voltage regulation, capacitor filtering, voltage dividers etc. A simple project that surrounds a power supply would be to build a power supply that rectifies AC to DC, then outputs a given voltage / current. Through this experimentation, you can build a power supply for your circuits on down the road. If you're not comfortable with working with AC mains lines yet, then I would let this project rest until you have a better understanding of electronics.
As a starter, I suggest looking here:
https://www.electronics-lab.com/projects/power/index.html
specifically the LM317 power supply. ( I think there is 3 or 4 different versions to chose from)
If you're not into power supplies, then check this page out. You can scroll through and find a circuit that sparks your interest.
https://www.commlinx.com.au/schematics.htm
If you're just beginning, and haven't begun to make any circuits yet, you might want to build something simple, like an LED flasher using transistors, or a 555 timer. You can expand from there and make some neat LED displays etc. If you're not into LED's, I suggest working with OP-Amps and learning about how to create comparators, oscillators, amplifiers, and voltage followers with an OP AMP. What you learn here will pay off on down the road. Here's a link to a simple OP-AMP tutorial which is pretty "down-to-earth" so to speak:
here's a tutorial on the 555 timer with some simple circuits to build and analyze:
PS> The people in this forum are generally VERY helpful with questions, if you have any.
Good luck and have fun!