Khan Academy — free learning for all ages

Khan Academy provides a large, free online library of lessons, practice exercises and step‑by‑step instructional videos in maths, science, computing and more, suitable for primary, secondary and adult learners. It’s free for all UK residents (no subscription required) and offers personalised learning dashboards, teacher and parent tools, and resources aligned to many curricula; sign up for a free account to track progress and access exercises on web or mobile apps. The platform is entirely free to use without payment.