CoursebeginnerFree
Data Structures and Algorithms in Python
freeCodeCamp.org
Master data structures and algorithms using Python! Free course from freeCodeCamp.org covers essential computer science concepts.
More resources on Data Structures
WebsiteFree
NeetCode
DS&A roadmap and videos
VideoFree
Abdul Bari Algorithms Playlist
Full course on DS and Algo
WebsiteFree
USFCA Data Structures
Free textbook and resources (underrated gem from r/learnprogramming)
WebsiteFree
LeetCode
Practice problems tagged by DS (practitioner favorite)
VideoFree
MIT 6.006 Lecture 1: Intro to Algorithms
MIT intro series (praised in r/csMajors)
VideoFree
freeCodeCamp Data Structures Full Course
JavaScript-focused DS&A (frequent mention in r/cscareerquestions)