Once the editor is open, click on "Create new symbol", select the library where you want to save the new symbol, and click ok, as shown below. However, if you feel that you don't need the symbol, move on to the next steps. Why do we need to create a new symbol before creating the footprint? You can also not do it, but usually, a symbol is associated with each footprint. Open a new project on KiCad and click on "Symbol editor" as shown in the screenshots below. If you get a footprint size wrong it could compromise your PCB, so pay close attention to the footprint size when downloading or designing a new one. Or at least check that the measurements of the downloaded footprint respect the dimensions of the components indicated in the manufacturer's documentation. Downloading footprints from little-known websites is not very recommended as they may not match the component you are using. In these cases the KiCad core library cannot help us, so we look for the footprint on some specific platform.
When designing a new circuit it happens very often to use components with not very common footprints.
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