Khan Academy offers free online courses, lessons, and practice in various subjects including math, science, and more for learners of all ages.

By logging in to Khan Academy, you agree to our Terms of use and Privacy Policy.

Created by experts, Khan Academy’s library of trusted, standards-aligned practice and lessons covers math K-12 through early college, grammar, science, history, AP®, SAT®, and more. …

2024年8月13日 · Whether you're a student, teacher, homeschooler, principal, adult returning to the classroom after 20 years, or a friendly alien trying to get a leg up in earthly biology — Khan …

Join Khan Academy to activate your learning Log in to Khan Academy to get started!

Khan Academy breaks down tough concepts in an easy manner and helps you understand subjects better without having to memorise them.

High Quality Prep for every section of the digital SAT with guidance from Khan Academy’s team of math, reading, and writing experts. Free Access all of our digital SAT prep materials for …

Khan Academy