To add to my colleague John's suggestion, also check this video:
Canon EOS R100 User's Guide (youtube.com)
You should also consider downloading the manual as a PDF for reference purposes. You can do a text search on this and it should be your first port of call if you need to clarify a feature or trouble-shoot an issue.
You can get going by putting the camera in one of the auto modes, but you will get the most out of your camera when you learn the basics of light metering and exposure, along with the controls that get the correct exposure: Shutter speed, ISO and Aperture. There are many combinations of those three that will achieve an acceptable exposure but the results to the photograph from a compositional point of view will vary dramatically.
So consider the following sources for learning about photography in general:
and the following series of videos from Canon:
Canon Training Articles - Tips & Tricks | Canon U.S.A., Inc.
cheers, TREVOR
The mark of good photographer is less what they hold in their hand, it's more what they hold in their head;
"All the variety, all the charm, all the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris
