nptel.ac.in
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NPTEL (National Programme on Technology Enhanced Learning) hosts free online courses from IITs/IISc with lecture videos, reading materials, assignments, and certificates across engineering, science, and humanities. It includes CS courses on data structures and trees, algorithms, and other technical topics with downloadable resources and learner forums.
More resources on Trees
Art of Problem Solving - Trees
Problem-solving resources and wiki
Tree (graph theory) - Wikipedia
Comprehensive reference with resources
Diestel Graph Theory
Free online textbook covering trees in depth
Graph Theory
Learn graph theory focusing on trees with Dr. Sarada Herke! Explore fundamentals and applications in this comprehensive course.
Algorithms, Part I
This course covers the essential information that every serious programmer needs to know about algorithms and data structures, with emphasis on applications and scientific performance analysis of Java implementations. Part I covers elementary data structures, sorting, and searching algorithms. Part II focuses on graph- and string-processing algorithms. All the features of this course are available for free. People who are interested in digging deeper into the content may wish to obtain the textbook Algorithms, Fourth Edition (upon which the course is based) or visit the website algs4.cs.princeton.edu for a wealth of additional material. This course does not offer a certificate upon completion.
Mathematics for Computer Science
Learn about trees in computer science with this course by Tom Leighton & Marten van Dijk. Explore mathematical foundations!