From the head stock
There are lots of loose ball bearings in there so be prepared to catch them in or on something.
there is a lot about servicing bikes on line if you look
More modern bikes may have a different arrangement where the headstock is held together with a long Allen bolt and have spacers to set the handlebar height. generally called a threadless head set.
You can look up how to dismantle them on line.
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Thanks a lot. The pics were really helpful!