These variations reflect the pedagogical output of G. F. Körner, intended for developing students. The work is clear in its structure and follows common variation procedures of the era.
Focus on consistent, even articulation in the passages that move away from the basic theme.
Comparable difficulty and character — good candidates for what to learn next.
12 Variations pour le piano-forte is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 3.
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 12 Variations pour le piano-forte lasts about 6 minutes.
12 Variations pour le piano-forte is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include 18 German Dances and Esoccaises by Franz Schubert, 18 German Dances and Ecossaises by Franz Schubert, 18 German Dances and Esoccaises, by Franz Schubert — see the full similar-pieces list on this page.