*This is a web-based instructional module on the algebra of sets.*

http://www.math-only-math.com/laws-of-algebra-of-sets.html

*Union of Sets:*

https://www.basic-mathematics.com/union-of-sets.html

*Intersection of Sets:*

https://www.basic-mathematics.com/intersection-of-sets.html

*Venn Diagrams for union and intersection:*

https://www.mathsisfun.com/sets/venn-diagrams.html