American Sign Language Website provides online ASL lessons and resources including themed vocabulary lessons, a progress tracker, activities for skill retention, and a 7,800+ sign video dictionary. Lessons vary in difficulty and include activities like matching signs and fingerspelling, unscrambling words, and choosing the correct sentence. Users can customize their vocabulary lists and track their individual progress. ASL grammar, the manual alphabet, and numbers are also covered on grammar pages and in lessons throughout the site.