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I am looking for an API tutorial with e.g. https://insomnia.rest/

Many powerful commands seem to exist only with the API. That's why I'd like to experiment with it a little.
But it already fails because of oauth 2.0, that somehow uses different names than some REST programs I tried. So for example: also https://insomnia.rest/ .
But maybe there is someone who has created a tutorial for this?