This is arguably the most recognizable ragtime composition, characterized by its infectious syncopated melodies and structured sectional form. Its wide appeal comes from the elegant balance between its catchy rhythmic hook and straightforward harmonic progression.
Achieving the correct 'swing' without rushing the syncopations is the essential technical hurdle.
Comparable difficulty and character — good candidates for what to learn next.
The Entertainer is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 6.
You should be comfortable at Henle level 4 — meaning you can already play level 3–4 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 The Entertainer lasts about 4 minutes.
The Entertainer 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 Binks' Waltz by Scott Joplin, Maple Leaf Rag by Scott Joplin, Solace by Scott Joplin — see the full similar-pieces list on this page.