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Khan Academy is a free online learning platform offering video lessons, practice problems, and quizzes across math and science, including geometry topics on 2D and 3D shapes, measurements, volumes, and surface area.
More resources on 3D Geometry
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GeoGebra
Free dynamic mathematics software combining geometry, algebra, spreadsheets, graphing, statistics, and calculus for interactive exploration.
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GeoGebra 3D Calculator
Free interactive 3D geometry tool
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Paul's Online Math Notes - Calculus III
Detailed notes on lines, planes, surfaces in 3D
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The Cross Product
Visualizing cross product in 3D
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Vectors, what even are they?
Introduction to vectors in 3D from 3Blue1Brown
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Vector Calculus
Learn 3D geometry with Dr. Trefor Bazett's vector calculus course! Master multivariable calculus concepts & problem-solving.