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nLab: Homomorphism
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Wiki entry defining homomorphisms as structure-preserving maps between algebraic structures and relating them to morphisms in a category, with links to monomorphisms, isomorphisms, and related notions. Suits readers who already know basic algebra and want the categorical framing.
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Wolfram MathWorld
MathWorld is an online mathematics encyclopedia from Wolfram Research offering detailed, browsable articles on topics across the math spectrum, including algebra, geometry, calculus, and number theory. Each entry includes definitions, theorems, formulas, diagrams, worked examples, and links to further reading.
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Abstract Algebra
Learn abstract algebra homomorphisms with Prof. Benedict Gross! Explore key concepts in this insightful course.