Khan Academy — free online lessons and practice for learners of all ages

Khan Academy provides a free, non‑profit library of lessons, videos and practice exercises in maths, science, computing and more, aimed at school‑age learners and adults wishing to brush up skills. The platform is free to use for anyone in the UK; you can create an account to track progress, use teacher/classroom tools, or learn independently without charge. To start, sign up and browse resources at https://www.khanacademy.org.