This 'Air' (BWV Anh. 131), often attributed to Bach, is a simple and charming piece, likely intended as an exercise or a simple song. Its appeal is in its straightforward melody and its clear, diatonic harmony.
Focus on clear articulation and a steady rhythm, aiming for a light and cheerful demeanor.
Air in F major (BWV Anh.131) is rated Henle level 2 of 9 — beginner repertoire, roughly ABRSM grades 2–3. In the RCM system it corresponds to about level 2.
You should be comfortable at Henle level 2 — meaning you can already play level 1–2 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 Air in F major (BWV Anh.131) lasts about 1.5 minutes.
Air in F major (BWV Anh.131) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.