new to onshape. i am looking for a very basic tutorial on navigation in onshape.

I do hope you will be very patient with me. my son has gotten me into 3d printing. I have been using tinkercad. He then wanted me to learn mastercam and now onshape.  I am a visual learner. I have looked at some videos on youtube but the people teaching leave out small steps and then I get lost. Is there a very basic tutorial on the buttons and what they are. I was a photographer for 35 years I did learn photoshop. It took me a while to learn but all I am looking for is how to move things around a design, how to measure distance and center a circle from an edge of a square thing like that. I wouls appreciate  any help in this direction.

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