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Hello @Anonymous
For your first question, take a look at the free introduction to DAX from SQLBI. https://www.sqlbi.com/p/introducing-dax-video-course/
Your total price calculation will be something along the lines of
Total Price = SUMX ( 'Table A', 'Table A'[Quantity] * RELATED ( 'Table B'[Price] ) )
Hello @Anonymous You need to watch the Introduction to DAX video I linked, it will help.