ocw.mit.edu
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MIT OpenCourseWare (ocw.mit.edu) is a free online repository of MIT course materials spanning numerous subjects. It offers complete course content—lecture notes, assignments, exams, and sometimes video lectures—so you can study topics like limits and colimits at your own pace.
More resources on Limits & Colimits
nLab: Colimit
Detailed entry on colimits with examples
nLab: Limit
Comprehensive reference on limits in category theory
Lectures on Category Theory
Learn limits & colimits in category theory with Emily Riehl's lectures. Master key concepts in this insightful course.
Category Theory for Programmers
Learn category theory's limits and colimits from Bartosz Milewski's engaging course. Essential for advanced programming concepts!
ncatlab.org
nLab is a collaborative online wiki for advanced mathematics, with a focus on category theory, higher categories, homotopy theory, type theory, and related areas. It provides rigorous definitions, explanations, and references on concepts such as limits and colimits, adjunctions, monoidal categories, and other foundational ideas.
mathworld.wolfram.com
Wolfram MathWorld is a comprehensive online mathematics encyclopedia offering detailed definitions, explanations, formulas, and examples across a wide range of topics. It includes entries on Limits and Colimits (and related category theory concepts) with formal definitions, properties, and illustrative examples.