A breadboard is a board that you can use to connect circuits without soldering. Breadboards are often used to build a simple circuit or to test an idea. When you are learning about circuits, you will come across a lot of little circuits that you want to test. Then the breadboard is really useful.
You can build pretty much any circuit that uses through-hole components on a breadboard – as long as you have enough space on it for all the connections and components. But there are lots of connections in some circuits, and this makes it harder to take control of all the wires going around. At some point you won’t be able to connect such circuits on breadboards. One way is to create your own circuit boards, because it won’t be as expensive and complicated as you thought.