Look past the cover
Start with the style, the intended level and the teaching language. “All levels” tells you less than a chapter list that names the foundations it assumes. Look for a sample lesson and the instructor’s own description of their background. A performance trailer shows the finished dance; it does not show how the movement is explained.
Watch a little before joining in
Preview one chapter while seated. Can you see the teacher’s whole body, hear the counts and identify where a phrase starts again? Note whether the view is mirrored, filmed from behind or presented face to face. These details matter more to following a lesson than a dramatic set or a long running time.
Check the disc and your player
Read the disc’s region, video format and subtitle information against your exact player manual. A DVD label is not a promise that every computer has the necessary drive or playback software. For a secondhand disc, ask for a clear picture of the back cover and a description of playback condition.
Give the lesson a place in your learning
Use a video to revisit an explanation and collect questions. It cannot see your movement or respond to you. If an instruction is unclear, pause and ask a suitably qualified teacher rather than guessing your way through it. Keep a note of the chapter and timestamp so the question is easy to discuss.