Best video on counting/clapping rhythm

Hey, so my teacher sort of exposed a weakness last week. I played through half my first method book just ‘winging it’ on the rhythm. Could anyone share what they feel is the best(or shows the most common method) video on how most people count aloud and/or clap the ‘rhythm’ of a piece. I sort of have a good idea now what my teacher wants but I just would like a little more thorough explanation so I can practice before I see him again. Thanks so much and best regards!