Learning electronics implies building circuits in breadboarding, however, if you want to have something more definitive breadboarding isn't a good option. On top of that, while you are learning those circuits they will become less understandably after some time. To avoid the need to find the likely lost schematic, or an arduous interpretation, a Self Explanatory Protoboard is handy.
To do so, you just need to print the schematic and glue it to a Protoboard, then you solder the components accordingly, knowing that in the future no other document will be needed!
Self Explanatory Protoboarding is most suitable for simple circuits, like the classic analog ones that you can find in the Wikipedia Categories about electronics:
Also, Youtube is full of these building blocks:
Step 1: Drawing the Schematics
Here you have two options, you may draw the schematic directly on the Protoboard with a Black Marker, or you can use a software like the Fritzing.
If you use the software, you may start with the attached file for a 22x10cm single sided protoboard, next print it, crop it and glue it to the protoboard.
Step 2: Soldering Components and Add Connectors
After you glue the paper schematic on the protoboard, solder the respective components accordingly, wire them as needed and solder paper clips to be used by alligators feeding the circuits or interconnect them.
NOTE: Look at the protoboard trough the light to identify and punch holes on the paper to insert the respective components. Use the probe tips of your multimeter for holes punching!
Step 3: Create Your Circuits Portfolio
Build your own portfolio of these protoboards, use them together as building blocks for more elaborated circuits and study them to learn how they work. Then you may store them knowing that nothing more you will need it to understand them again!