Do not include too many videos and don’t choose too long videos - two minutes should be the approximate maximum (although there will be exceptions, of course).
Videos should have good visual and sound quality (i.e., brightness needs to be suitable to see what is happening and sound should not include excessive static or background noise).
Videos accompanied only with music (no voice-over explanations) should have accurate textual cues to explain what is happening during the viewing of the visual imagery.
Also please note that if you embed videos in Graasp (by dragging them into the ILS) and many students start the ILS at the same time (when your lesson begins) this may result in longer loading times. You may reduce this by linking the videos from YouTube.