Mozart's early Piano Sonatas, Op. 6, showcase his developing genius with charming melodies and graceful phrasing. They often feature Alberti bass accompaniments and clear sonata form structures.
Develop a light and even touch for the Alberti bass patterns.
3 Piano Sonatas (Op.6) is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 4.
You should be comfortable at Henle level 3 — meaning you can already play level 2–3 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of 3 Piano Sonatas (Op.6) lasts about 12 minutes.
3 Piano Sonatas (Op.6) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.