Best free courses on YouTube, ranked by hours

Complete, free playlists for each subject, with their real total watch time — measured from the videos, not the thumbnails.

• Best free Python courses on YouTube, ranked by total hours · 9 courses
  Nine complete, free Python courses on YouTube — Corey Schafer, CS50P, MIT, CodeWithHarry, Bro Code and more — with the live total watch time of each playlist, so you can pick one that fits your calendar.
• Best free JavaScript courses on YouTube, ranked by total hours · 9 courses
  Nine complete, free JavaScript courses on YouTube — Namaste JavaScript, Net Ninja, Traversy Media, Chai aur Code, Bro Code and more — with the live total watch time of each playlist.
• Best free machine learning courses on YouTube, ranked by total hours · 9 courses
  Nine complete, free machine learning courses on YouTube — Stanford CS229 with Andrew Ng, StatQuest, MIT 6.S191, CampusX's 100 Days of ML, Krish Naik and more — with the live total watch time of each playlist.
• Best free DSA courses on YouTube, ranked by total hours · 10 courses
  Ten complete, free data-structures-and-algorithms courses on YouTube — Striver's A2Z, Apna College, Love Babbar, Abdul Bari, Jenny's Lectures, MIT 6.006 and more — with the live total watch time of each playlist.
• Best free Excel courses on YouTube, ranked by total hours · 10 courses
  Ten complete, free Excel courses on YouTube — Kevin Stratvert, Leila Gharani, excelisfun, MyOnlineTrainingHub, TeachExcel — from first spreadsheet to Power Query and data analysis, with the live total watch time of each playlist.