A rare example of Chopin experimenting with strict counterpoint, likely written during his studies with Elsner. It is distinctive for its academic rigor, contrasting sharply with his famous ornate nocturnes and waltzes.
Careful attention must be paid to the phrasing of the canonic subject to ensure it sounds cohesive across both voices.
Comparable difficulty and character — good candidates for what to learn next.
Canon in F minor (B.129a) 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 Canon in F minor (B.129a) lasts about 2 minutes.
Canon in F minor (B.129a) 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 Canon in F minor by Frédéric Chopin, Waltz in D-flat major, No. 1 by Frédéric Chopin, Waltz in A minor by Frédéric Chopin — see the full similar-pieces list on this page.